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678031 = 3791789
BaseRepresentation
bin10100101100010001111
31021110002021
42211202033
5133144111
622311011
75522524
oct2454217
91243067
10678031
11423462
12288467
131a9803
1413914b
15d5d71
hexa588f

678031 has 4 divisors (see below), whose sum is σ = 680200. Its totient is φ = 675864.

The previous prime is 678023. The next prime is 678037. The reversal of 678031 is 130876.

678031 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 678031 - 23 = 678023 is a prime.

It is a super-2 number, since 2×6780312 = 919452073922, which contains 22 as substring.

It is a pancake number, because a pancake can be divided into 678031 parts by 1164 straight cuts.

It is a Duffinian number.

678031 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 677987 and 678005.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 678031.

It is not an unprimeable number, because it can be changed into a prime (678037) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 516 + ... + 1273.

It is an arithmetic number, because the mean of its divisors is an integer number (170050).

2678031 is an apocalyptic number.

678031 is a deficient number, since it is larger than the sum of its proper divisors (2169).

678031 is a wasteful number, since it uses less digits than its factorization.

678031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2168.

The product of its (nonzero) digits is 1008, while the sum is 25.

The square root of 678031 is about 823.4263780084. The cubic root of 678031 is about 87.8516353339.

The spelling of 678031 in words is "six hundred seventy-eight thousand, thirty-one".

Divisors: 1 379 1789 678031