101638788 has 12 divisors (see below), whose sum is σ = 237157200. Its totient is φ = 33879592.

The previous prime is 101638781. The next prime is 101638811. The reversal of 101638788 is 887836101.

It is a tau number, because it is divible by the number of its divisors (12).

It is a super-2 number, since 2×101638788² = 20660886452217888, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (101638781) 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 3 ways as a sum of consecutive naturals, for example, 4234938 + ... + 4234961.

It is an arithmetic number, because the mean of its divisors is an integer number (19763100).

Almost surely, 2^101638788 is an apocalyptic number.

It is an amenable number.

101638788 is an abundant number, since it is smaller than the sum of its proper divisors (135518412).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

101638788 is a wasteful number, since it uses less digits than its factorization.

101638788 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8469906 (or 8469904 counting only the distinct ones).

The product of its (nonzero) digits is 64512, while the sum is 42.

The square root of 101638788 is about 10081.6064196139. The cubic root of 101638788 is about 466.6806841594.

The spelling of 101638788 in words is "one hundred one million, six hundred thirty-eight thousand, seven hundred eighty-eight".