100999864 has 16 divisors (see below), whose sum is σ = 216428400. Its totient is φ = 43285632.

The previous prime is 100999861. The next prime is 100999867. The reversal of 100999864 is 468999001.

It is an interprime number because it is at equal distance from previous prime (100999861) and next prime (100999867).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (100999861) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 901729 + ... + 901840.

It is an arithmetic number, because the mean of its divisors is an integer number (13526775).

Almost surely, 2^100999864 is an apocalyptic number.

100999864 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

100999864 is an abundant number, since it is smaller than the sum of its proper divisors (115428536).

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

100999864 is a wasteful number, since it uses less digits than its factorization.

100999864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1803582 (or 1803578 counting only the distinct ones).

The product of its (nonzero) digits is 139968, while the sum is 46.

The square root of 100999864 is about 10049.8688548657. The cubic root of 100999864 is about 465.7007417528.

The spelling of 100999864 in words is "one hundred million, nine hundred ninety-nine thousand, eight hundred sixty-four".