78890977 has 8 divisors (see below), whose sum is σ = 87687360. Its totient is φ = 70365360.

The previous prime is 78890971. The next prime is 78891013. The reversal of 78890977 is 77909887.

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

It is a cyclic number.

It is not a de Polignac number, because 78890977 - 2³ = 78890969 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78890971) 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, 67077 + ... + 68242.

It is an arithmetic number, because the mean of its divisors is an integer number (10960920).

Almost surely, 2^78890977 is an apocalyptic number.

It is an amenable number.

78890977 is a deficient number, since it is larger than the sum of its proper divisors (8796383).

78890977 is a wasteful number, since it uses less digits than its factorization.

78890977 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 135383.

The product of its (nonzero) digits is 1778112, while the sum is 55.

The square root of 78890977 is about 8882.0592769920. The cubic root of 78890977 is about 428.8865677427.

The spelling of 78890977 in words is "seventy-eight million, eight hundred ninety thousand, nine hundred seventy-seven".