78925857 has 16 divisors (see below), whose sum is σ = 110315520. Its totient is φ = 50097872.

The previous prime is 78925853. The next prime is 78925877. The reversal of 78925857 is 75852987.

It is a cyclic number.

It is not a de Polignac number, because 78925857 - 2² = 78925853 is a prime.

It is not an unprimeable number, because it can be changed into a prime (78925853) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13144 + ... + 18182.

It is an arithmetic number, because the mean of its divisors is an integer number (6894720).

Almost surely, 2^78925857 is an apocalyptic number.

It is an amenable number.

78925857 is a deficient number, since it is larger than the sum of its proper divisors (31389663).

78925857 is a wasteful number, since it uses less digits than its factorization.

78925857 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5292.

The product of its digits is 1411200, while the sum is 51.

The square root of 78925857 is about 8884.0225686341. The cubic root of 78925857 is about 428.9497661798.

The spelling of 78925857 in words is "seventy-eight million, nine hundred twenty-five thousand, eight hundred fifty-seven".