78039525 has 24 divisors (see below), whose sum is σ = 129768480. Its totient is φ = 41381440.

The previous prime is 78039509. The next prime is 78039527. The reversal of 78039525 is 52593087.

It is not a de Polignac number, because 78039525 - 2⁴ = 78039509 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78039527) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 10519 + ... + 16331.

It is an arithmetic number, because the mean of its divisors is an integer number (5407020).

Almost surely, 2^78039525 is an apocalyptic number.

78039525 is a gapful number since it is divisible by the number (75) formed by its first and last digit.

It is an amenable number.

78039525 is a deficient number, since it is larger than the sum of its proper divisors (51728955).

78039525 is a wasteful number, since it uses less digits than its factorization.

78039525 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6005 (or 6000 counting only the distinct ones).

The product of its (nonzero) digits is 75600, while the sum is 39.

The square root of 78039525 is about 8833.9982454153. The cubic root of 78039525 is about 427.3380255704.

The spelling of 78039525 in words is "seventy-eight million, thirty-nine thousand, five hundred twenty-five".