102731820 has 24 divisors (see below), whose sum is σ = 287649264. Its totient is φ = 27395136.

The previous prime is 102731819. The next prime is 102731831. The reversal of 102731820 is 28137201.

102731820 = 3580² + 3581² + ... + 3587².

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 856039 + ... + 856158.

It is an arithmetic number, because the mean of its divisors is an integer number (11985386).

Almost surely, 2^102731820 is an apocalyptic number.

102731820 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

102731820 is an abundant number, since it is smaller than the sum of its proper divisors (184917444).

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

102731820 is a wasteful number, since it uses less digits than its factorization.

102731820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1712209 (or 1712207 counting only the distinct ones).

The product of its (nonzero) digits is 672, while the sum is 24.

The square root of 102731820 is about 10135.6706734187. The cubic root of 102731820 is about 468.3476305318.

The spelling of 102731820 in words is "one hundred two million, seven hundred thirty-one thousand, eight hundred twenty".