100978690 has 16 divisors (see below), whose sum is σ = 183431160. Its totient is φ = 40020480.

The previous prime is 100978651. The next prime is 100978693. The reversal of 100978690 is 96879001.

It can be written as a sum of positive squares in 4 ways, for example, as 100942209 + 36481 = 10047^2 + 191^2 .

It is a super-2 number, since 2×100978690² = 20393391668232200, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (100978693) 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 7 ways as a sum of consecutive naturals, for example, 45231 + ... + 47410.

Almost surely, 2^100978690 is an apocalyptic number.

100978690 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

100978690 is a deficient number, since it is larger than the sum of its proper divisors (82452470).

100978690 is a wasteful number, since it uses less digits than its factorization.

100978690 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 92757.

The product of its (nonzero) digits is 27216, while the sum is 40.

The square root of 100978690 is about 10048.8153530653. The cubic root of 100978690 is about 465.6681957134.

The spelling of 100978690 in words is "one hundred million, nine hundred seventy-eight thousand, six hundred ninety".