78451977 has 16 divisors (see below), whose sum is σ = 108195840. Its totient is φ = 50533392.

The previous prime is 78451949. The next prime is 78451981. The reversal of 78451977 is 77915487.

It is not a de Polignac number, because 78451977 - 2⁸ = 78451721 is a prime.

It is not an unprimeable number, because it can be changed into a prime (78451937) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7618 + ... + 14660.

It is an arithmetic number, because the mean of its divisors is an integer number (6762240).

Almost surely, 2^78451977 is an apocalyptic number.

It is an amenable number.

78451977 is a deficient number, since it is larger than the sum of its proper divisors (29743863).

78451977 is a wasteful number, since it uses less digits than its factorization.

78451977 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7172.

The product of its digits is 493920, while the sum is 48.

The square root of 78451977 is about 8857.3120640519. The cubic root of 78451977 is about 428.0895542217.

The spelling of 78451977 in words is "seventy-eight million, four hundred fifty-one thousand, nine hundred seventy-seven".