108639777 has 16 divisors (see below), whose sum is σ = 153077760. Its totient is φ = 68344272.

The previous prime is 108639749. The next prime is 108639781. The reversal of 108639777 is 777936801.

It is a happy number.

It is not a de Polignac number, because 108639777 - 2²³ = 100251169 is a prime.

It is a super-2 number, since 2×108639777² = 23605202293219458, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (108639077) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11368 + ... + 18614.

It is an arithmetic number, because the mean of its divisors is an integer number (9567360).

Almost surely, 2^108639777 is an apocalyptic number.

It is an amenable number.

108639777 is a deficient number, since it is larger than the sum of its proper divisors (44437983).

108639777 is a wasteful number, since it uses less digits than its factorization.

108639777 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7532.

The product of its (nonzero) digits is 444528, while the sum is 48.

The square root of 108639777 is about 10423.0406791876. The cubic root of 108639777 is about 477.1588191705.

The spelling of 108639777 in words is "one hundred eight million, six hundred thirty-nine thousand, seven hundred seventy-seven".