100781608 has 16 divisors (see below), whose sum is σ = 193575060. Its totient is φ = 49161600.

The previous prime is 100781581. The next prime is 100781609. The reversal of 100781608 is 806187001.

It can be written as a sum of positive squares in 2 ways, for example, as 100761444 + 20164 = 10038^2 + 142^2 .

It is a super-2 number, since 2×100781608² = 20313865022131328, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 100781608.

It is not an unprimeable number, because it can be changed into a prime (100781609) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 153303 + ... + 153958.

Almost surely, 2^100781608 is an apocalyptic number.

It is an amenable number.

100781608 is a deficient number, since it is larger than the sum of its proper divisors (92793452).

100781608 is a wasteful number, since it uses less digits than its factorization.

100781608 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 307308 (or 307304 counting only the distinct ones).

The product of its (nonzero) digits is 2688, while the sum is 31.

The square root of 100781608 is about 10039.0043331000. The cubic root of 100781608 is about 465.3650472954.

The spelling of 100781608 in words is "one hundred million, seven hundred eighty-one thousand, six hundred eight".