102815540 has 12 divisors (see below), whose sum is σ = 215912676. Its totient is φ = 41126208.

The previous prime is 102815533. The next prime is 102815549. The reversal of 102815540 is 45518201.

It can be written as a sum of positive squares in 2 ways, for example, as 63552784 + 39262756 = 7972^2 + 6266^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (102815549) 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, 2570369 + ... + 2570408.

It is an arithmetic number, because the mean of its divisors is an integer number (17992723).

Almost surely, 2^102815540 is an apocalyptic number.

102815540 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

102815540 is an abundant number, since it is smaller than the sum of its proper divisors (113097136).

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

102815540 is a wasteful number, since it uses less digits than its factorization.

102815540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5140786 (or 5140784 counting only the distinct ones).

The product of its (nonzero) digits is 1600, while the sum is 26.

The square root of 102815540 is about 10139.7998007850. The cubic root of 102815540 is about 468.4748206507.

The spelling of 102815540 in words is "one hundred two million, eight hundred fifteen thousand, five hundred forty".