78279725 has 24 divisors (see below), whose sum is σ = 100201920. Its totient is φ = 60635520.

The previous prime is 78279709. The next prime is 78279739. The reversal of 78279725 is 52797287.

It is not a de Polignac number, because 78279725 - 2⁴ = 78279709 is a prime.

It is a super-2 number, since 2×78279725² = 12255430692151250, which contains 22 as substring.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 78279725.

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, 107312 + ... + 108038.

It is an arithmetic number, because the mean of its divisors is an integer number (4175080).

Almost surely, 2^78279725 is an apocalyptic number.

It is an amenable number.

78279725 is a deficient number, since it is larger than the sum of its proper divisors (21922195).

78279725 is a wasteful number, since it uses less digits than its factorization.

78279725 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 869 (or 864 counting only the distinct ones).

The product of its digits is 493920, while the sum is 47.

The square root of 78279725 is about 8847.5830032840. The cubic root of 78279725 is about 427.7760149975.

The spelling of 78279725 in words is "seventy-eight million, two hundred seventy-nine thousand, seven hundred twenty-five".