100812456 has 24 divisors (see below), whose sum is σ = 273033930. Its totient is φ = 33604128.

The previous prime is 100812451. The next prime is 100812479. The reversal of 100812456 is 654218001.

It can be written as a sum of positive squares in only one way, i.e., 83722500 + 17089956 = 9150^2 + 4134^2 .

It is a tau number, because it is divible by the number of its divisors (24).

It is not an unprimeable number, because it can be changed into a prime (100812451) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 700015 + ... + 700158.

Almost surely, 2^100812456 is an apocalyptic number.

It is an amenable number.

100812456 is an abundant number, since it is smaller than the sum of its proper divisors (172221474).

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

100812456 is a wasteful number, since it uses less digits than its factorization.

100812456 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1400185 (or 1400178 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 27.

The square root of 100812456 is about 10040.5406228948. The cubic root of 100812456 is about 465.4125232744.

The spelling of 100812456 in words is "one hundred million, eight hundred twelve thousand, four hundred fifty-six".