78565925 has 24 divisors (see below), whose sum is σ = 103633992. Its totient is φ = 58880000.

The previous prime is 78565909. The next prime is 78565937. The reversal of 78565925 is 52956587.

It can be written as a sum of positive squares in 12 ways, for example, as 1442401 + 77123524 = 1201^2 + 8782^2 .

It is not a de Polignac number, because 78565925 - 2⁴ = 78565909 is a prime.

It is a super-2 number, since 2×78565925² = 12345209142211250, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 78565925.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 170195 + ... + 170655.

It is an arithmetic number, because the mean of its divisors is an integer number (4318083).

Almost surely, 2^78565925 is an apocalyptic number.

It is an amenable number.

78565925 is a deficient number, since it is larger than the sum of its proper divisors (25068067).

78565925 is a wasteful number, since it uses less digits than its factorization.

78565925 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 889 (or 884 counting only the distinct ones).

The product of its digits is 756000, while the sum is 47.

The square root of 78565925 is about 8863.7421555458. The cubic root of 78565925 is about 428.2967142897.

The spelling of 78565925 in words is "seventy-eight million, five hundred sixty-five thousand, nine hundred twenty-five".