100978689 has 16 divisors (see below), whose sum is σ = 155399040. Its totient is φ = 57129600.

The previous prime is 100978651. The next prime is 100978693. The reversal of 100978689 is 986879001.

It is a happy number.

It is not a de Polignac number, because 100978689 - 2⁸ = 100978433 is a prime.

It is not an unprimeable number, because it can be changed into a prime (100978289) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 21684 + ... + 25925.

It is an arithmetic number, because the mean of its divisors is an integer number (9712440).

Almost surely, 2^100978689 is an apocalyptic number.

It is an amenable number.

100978689 is a deficient number, since it is larger than the sum of its proper divisors (54420351).

100978689 is a wasteful number, since it uses less digits than its factorization.

100978689 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47720.

The product of its (nonzero) digits is 217728, while the sum is 48.

The square root of 100978689 is about 10048.8153033081. The cubic root of 100978689 is about 465.6681941762.

The spelling of 100978689 in words is "one hundred million, nine hundred seventy-eight thousand, six hundred eighty-nine".