78705725 has 24 divisors (see below), whose sum is σ = 112968960. Its totient is φ = 53277120.

The previous prime is 78705721. The next prime is 78705749. The reversal of 78705725 is 52750787.

It is not a de Polignac number, because 78705725 - 2² = 78705721 is a prime.

It is a super-2 number, since 2×78705725² = 12389182295551250, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78705721) 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, 10979 + ... + 16671.

It is an arithmetic number, because the mean of its divisors is an integer number (4707040).

Almost surely, 2^78705725 is an apocalyptic number.

It is an amenable number.

78705725 is a deficient number, since it is larger than the sum of its proper divisors (34263235).

78705725 is a wasteful number, since it uses less digits than its factorization.

78705725 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5789 (or 5784 counting only the distinct ones).

The product of its (nonzero) digits is 137200, while the sum is 41.

The square root of 78705725 is about 8871.6247102771. The cubic root of 78705725 is about 428.5506004428.

The spelling of 78705725 in words is "seventy-eight million, seven hundred five thousand, seven hundred twenty-five".