78955977 has 16 divisors (see below), whose sum is σ = 109481472. Its totient is φ = 50559360.

The previous prime is 78955969. The next prime is 78955993. The reversal of 78955977 is 77955987.

It is not a de Polignac number, because 78955977 - 2³ = 78955969 is a prime.

It is not an unprimeable number, because it can be changed into a prime (78955957) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9643 + ... + 15839.

It is an arithmetic number, because the mean of its divisors is an integer number (6842592).

Almost surely, 2^78955977 is an apocalyptic number.

It is an amenable number.

78955977 is a deficient number, since it is larger than the sum of its proper divisors (30525495).

78955977 is a wasteful number, since it uses less digits than its factorization.

78955977 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6368.

The product of its digits is 5556600, while the sum is 57.

The square root of 78955977 is about 8885.7175849787. The cubic root of 78955977 is about 429.0043250796.

The spelling of 78955977 in words is "seventy-eight million, nine hundred fifty-five thousand, nine hundred seventy-seven".