78925517 has 12 divisors (see below), whose sum is σ = 87984288. Its totient is φ = 70732200.

The previous prime is 78925513. The next prime is 78925519. The reversal of 78925517 is 71552987.

It is not a de Polignac number, because 78925517 - 2² = 78925513 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78925513) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3998 + ... + 13184.

It is an arithmetic number, because the mean of its divisors is an integer number (7332024).

Almost surely, 2^78925517 is an apocalyptic number.

It is an amenable number.

78925517 is a deficient number, since it is larger than the sum of its proper divisors (9058771).

78925517 is a wasteful number, since it uses less digits than its factorization.

78925517 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9280 (or 9269 counting only the distinct ones).

The product of its digits is 176400, while the sum is 44.

The square root of 78925517 is about 8884.0034331376. The cubic root of 78925517 is about 428.9491502298.

The spelling of 78925517 in words is "seventy-eight million, nine hundred twenty-five thousand, five hundred seventeen".