100781856 has 72 divisors (see below), whose sum is σ = 327547584. Its totient is φ = 28794240.

The previous prime is 100781843. The next prime is 100781861. The reversal of 100781856 is 658187001.

It is a tau number, because it is divible by the number of its divisors (72).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 100781856.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 22980 + ... + 27011.

It is an arithmetic number, because the mean of its divisors is an integer number (4549272).

Almost surely, 2^100781856 is an apocalyptic number.

100781856 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

100781856 is an abundant number, since it is smaller than the sum of its proper divisors (226765728).

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

100781856 is a wasteful number, since it uses less digits than its factorization.

100781856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50014 (or 50003 counting only the distinct ones).

The product of its (nonzero) digits is 13440, while the sum is 36.

The square root of 100781856 is about 10039.0166849149. The cubic root of 100781856 is about 465.3654290133.

The spelling of 100781856 in words is "one hundred million, seven hundred eighty-one thousand, eight hundred fifty-six".