102642840 has 48 divisors (see below), whose sum is σ = 333590400. Its totient is φ = 27371328.

The previous prime is 102642779. The next prime is 102642871. The reversal of 102642840 is 48246201.

102642840 is a `hidden beast` number, since 10 + 2 + 642 + 8 + 4 + 0 = 666.

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, 142200 + ... + 142919.

It is an arithmetic number, because the mean of its divisors is an integer number (6949800).

Almost surely, 2^102642840 is an apocalyptic number.

102642840 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

102642840 is an abundant number, since it is smaller than the sum of its proper divisors (230947560).

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

102642840 is a wasteful number, since it uses less digits than its factorization.

102642840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 285136 (or 285129 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 27.

The square root of 102642840 is about 10131.2802744767. The cubic root of 102642840 is about 468.2123734789.

The spelling of 102642840 in words is "one hundred two million, six hundred forty-two thousand, eight hundred forty".