78870977 has 4 divisors (see below), whose sum is σ = 79185456. Its totient is φ = 78556500.

The previous prime is 78870941. The next prime is 78870997. The reversal of 78870977 is 77907887.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 78870977 - 2⁸ = 78870721 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78870997) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 156863 + ... + 157364.

It is an arithmetic number, because the mean of its divisors is an integer number (19796364).

Almost surely, 2^78870977 is an apocalyptic number.

It is an amenable number.

78870977 is a deficient number, since it is larger than the sum of its proper divisors (314479).

78870977 is a wasteful number, since it uses less digits than its factorization.

78870977 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 314478.

The product of its (nonzero) digits is 1382976, while the sum is 53.

The square root of 78870977 is about 8880.9333405898. The cubic root of 78870977 is about 428.8503217036.

The spelling of 78870977 in words is "seventy-eight million, eight hundred seventy thousand, nine hundred seventy-seven".