678057 has 8 divisors (see below), whose sum is σ = 915840. Its totient is φ = 446160.

The previous prime is 678047. The next prime is 678061. The reversal of 678057 is 750876.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 678057 - 2¹¹ = 676009 is a prime.

It is a super-2 number, since 2×678057² = 919522590498, which contains 22 as substring.

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 7 ways as a sum of consecutive naturals, for example, 1194 + ... + 1667.

It is an arithmetic number, because the mean of its divisors is an integer number (114480).

2⁶⁷⁸⁰⁵⁷ is an apocalyptic number.

It is an amenable number.

678057 is a deficient number, since it is larger than the sum of its proper divisors (237783).

678057 is a wasteful number, since it uses less digits than its factorization.

678057 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2943.

The product of its (nonzero) digits is 11760, while the sum is 33.

The square root of 678057 is about 823.4421655466. The cubic root of 678057 is about 87.8527582488.

The spelling of 678057 in words is "six hundred seventy-eight thousand, fifty-seven".