100815870 has 16 divisors (see below), whose sum is σ = 241958160. Its totient is φ = 26884224.

The previous prime is 100815857. The next prime is 100815901. The reversal of 100815870 is 78518001.

It is a Harshad number since it is a multiple of its sum of digits (30), and also a Moran number because the ratio is a prime number: 3360529 = 100815870 / (1 + 0 + 0 + 8 + 1 + 5 + 8 + 7 + 0).

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1680235 + ... + 1680294.

It is an arithmetic number, because the mean of its divisors is an integer number (15122385).

Almost surely, 2^100815870 is an apocalyptic number.

100815870 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

100815870 is an abundant number, since it is smaller than the sum of its proper divisors (141142290).

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

100815870 is a wasteful number, since it uses less digits than its factorization.

100815870 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3360539.

The product of its (nonzero) digits is 2240, while the sum is 30.

The square root of 100815870 is about 10040.7106322212. The cubic root of 100815870 is about 465.4177769256.

It can be divided in two parts, 10081 and 5870, that added together give a palindrome (15951).

The spelling of 100815870 in words is "one hundred million, eight hundred fifteen thousand, eight hundred seventy".