77638959 has 16 divisors (see below), whose sum is σ = 121075200. Its totient is φ = 49034808.

The previous prime is 77638943. The next prime is 77638963. The reversal of 77638959 is 95983677.

It is not a de Polignac number, because 77638959 - 2⁴ = 77638943 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77638919) 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, 75159 + ... + 76184.

It is an arithmetic number, because the mean of its divisors is an integer number (7567200).

Almost surely, 2^77638959 is an apocalyptic number.

77638959 is a deficient number, since it is larger than the sum of its proper divisors (43436241).

77638959 is a wasteful number, since it uses less digits than its factorization.

77638959 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 151371 (or 151365 counting only the distinct ones).

The product of its digits is 2857680, while the sum is 54.

The square root of 77638959 is about 8811.2972370701. The cubic root of 77638959 is about 426.6056155187.

The spelling of 77638959 in words is "seventy-seven million, six hundred thirty-eight thousand, nine hundred fifty-nine".