78973557 has 32 divisors (see below), whose sum is σ = 120193920. Its totient is φ = 45722880.

The previous prime is 78973549. The next prime is 78973561. The reversal of 78973557 is 75537987.

It is not a de Polignac number, because 78973557 - 2³ = 78973549 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78973537) 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 31 ways as a sum of consecutive naturals, for example, 145707 + ... + 146247.

It is an arithmetic number, because the mean of its divisors is an integer number (3756060).

Almost surely, 2^78973557 is an apocalyptic number.

It is an amenable number.

78973557 is a deficient number, since it is larger than the sum of its proper divisors (41220363).

78973557 is a wasteful number, since it uses less digits than its factorization.

78973557 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 773.

The product of its digits is 1852200, while the sum is 51.

The square root of 78973557 is about 8886.7067578491. The cubic root of 78973557 is about 429.0361628059.

The spelling of 78973557 in words is "seventy-eight million, nine hundred seventy-three thousand, five hundred fifty-seven".