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78625 = 531737
BaseRepresentation
bin10011001100100001
310222212001
4103030201
510004000
61404001
7445141
oct231441
9128761
1078625
1154088
1239601
1329a31
1420921
151846a
hex13321

78625 has 16 divisors (see below), whose sum is σ = 106704. Its totient is φ = 57600.

The previous prime is 78623. The next prime is 78643. The reversal of 78625 is 52687.

It can be written as a sum of positive squares in 8 ways, for example, as 4096 + 74529 = 64^2 + 273^2 .

It is not a de Polignac number, because 78625 - 21 = 78623 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 78593 and 78602.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78623) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2107 + ... + 2143.

It is an arithmetic number, because the mean of its divisors is an integer number (6669).

278625 is an apocalyptic number.

It is an amenable number.

78625 is a deficient number, since it is larger than the sum of its proper divisors (28079).

78625 is a wasteful number, since it uses less digits than its factorization.

78625 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 69 (or 59 counting only the distinct ones).

The product of its digits is 3360, while the sum is 28.

The square root of 78625 is about 280.4014978562. The cubic root of 78625 is about 42.8404035156.

It can be divided in two parts, 78 and 625, that added together give a triangular number (703 = T37).

The spelling of 78625 in words is "seventy-eight thousand, six hundred twenty-five".

Divisors: 1 5 17 25 37 85 125 185 425 629 925 2125 3145 4625 15725 78625