100978978 has 4 divisors (see below), whose sum is σ = 151468470. Its totient is φ = 50489488.

The previous prime is 100978967. The next prime is 100979009. The reversal of 100978978 is 879879001.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 879879001 = 73 ⋅12053137.

It can be written as a sum of positive squares in only one way, i.e., 51796809 + 49182169 = 7197^2 + 7013^2 .

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25244743 + ... + 25244746.

Almost surely, 2^100978978 is an apocalyptic number.

100978978 is a deficient number, since it is larger than the sum of its proper divisors (50489492).

100978978 is an equidigital number, since it uses as much as digits as its factorization.

100978978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50489491.

The product of its (nonzero) digits is 254016, while the sum is 49.

The square root of 100978978 is about 10048.8296831024. The cubic root of 100978978 is about 465.6686384217.

The spelling of 100978978 in words is "one hundred million, nine hundred seventy-eight thousand, nine hundred seventy-eight".