100761978 has 16 divisors (see below), whose sum is σ = 212130720. Its totient is φ = 31819536.

The previous prime is 100761977. The next prime is 100762001. The reversal of 100761978 is 879167001.

It is not an unprimeable number, because it can be changed into a prime (100761977) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 441825 + ... + 442052.

It is an arithmetic number, because the mean of its divisors is an integer number (13258170).

Almost surely, 2^100761978 is an apocalyptic number.

100761978 is an abundant number, since it is smaller than the sum of its proper divisors (111368742).

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

100761978 is a wasteful number, since it uses less digits than its factorization.

100761978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 883901.

The product of its (nonzero) digits is 21168, while the sum is 39.

The square root of 100761978 is about 10038.0265988888. The cubic root of 100761978 is about 465.3348311040.

The spelling of 100761978 in words is "one hundred million, seven hundred sixty-one thousand, nine hundred seventy-eight".