102479640 has 64 divisors (see below), whose sum is σ = 315761760. Its totient is φ = 26588160.

The previous prime is 102479617. The next prime is 102479653. The reversal of 102479640 is 46974201.

It is a happy number.

It is a super-2 number, since 2×102479640² = 21004153229059200, 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 15 ways as a sum of consecutive naturals, for example, 7101 + ... + 15980.

Almost surely, 2^102479640 is an apocalyptic number.

102479640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

102479640 is an abundant number, since it is smaller than the sum of its proper divisors (213282120).

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

102479640 is a wasteful number, since it uses less digits than its factorization.

102479640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23132 (or 23128 counting only the distinct ones).

The product of its (nonzero) digits is 12096, while the sum is 33.

The square root of 102479640 is about 10123.2228069919. Note that the first 3 decimals coincide. The cubic root of 102479640 is about 467.9640925040.

The spelling of 102479640 in words is "one hundred two million, four hundred seventy-nine thousand, six hundred forty".