102857990 has 24 divisors (see below), whose sum is σ = 196681392. Its totient is φ = 38721920.

The previous prime is 102857987. The next prime is 102858023. The reversal of 102857990 is 99758201.

It is a super-2 number, since 2×102857990² = 21159532213680200, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 14906 + ... + 20685.

It is an arithmetic number, because the mean of its divisors is an integer number (8195058).

Almost surely, 2^102857990 is an apocalyptic number.

102857990 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

102857990 is a deficient number, since it is larger than the sum of its proper divisors (93823402).

102857990 is a wasteful number, since it uses less digits than its factorization.

102857990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35632 (or 35615 counting only the distinct ones).

The product of its (nonzero) digits is 45360, while the sum is 41.

The square root of 102857990 is about 10141.8928213623. The cubic root of 102857990 is about 468.5392856783.

The spelling of 102857990 in words is "one hundred two million, eight hundred fifty-seven thousand, nine hundred ninety".