78897957 has 8 divisors (see below), whose sum is σ = 106282176. Its totient is φ = 52056192.

The previous prime is 78897947. The next prime is 78897961. The reversal of 78897957 is 75979887.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 78897957 - 2⁷ = 78897829 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 78897957.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78897947) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 135273 + ... + 135854.

It is an arithmetic number, because the mean of its divisors is an integer number (13285272).

Almost surely, 2^78897957 is an apocalyptic number.

It is an amenable number.

78897957 is a deficient number, since it is larger than the sum of its proper divisors (27384219).

78897957 is a wasteful number, since it uses less digits than its factorization.

78897957 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 271227.

The product of its digits is 8890560, while the sum is 60.

The square root of 78897957 is about 8882.4521951993. The cubic root of 78897957 is about 428.8992161683.

The spelling of 78897957 in words is "seventy-eight million, eight hundred ninety-seven thousand, nine hundred fifty-seven".