815132540 has 48 divisors (see below), whose sum is σ = 1743565824. Its totient is φ = 320040000.

The previous prime is 815132537. The next prime is 815132561. The reversal of 815132540 is 45231518.

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, 355277 + ... + 357563.

It is an arithmetic number, because the mean of its divisors is an integer number (36324288).

Almost surely, 2^815132540 is an apocalyptic number.

It is an amenable number.

815132540 is an abundant number, since it is smaller than the sum of its proper divisors (928433284).

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

815132540 is a wasteful number, since it uses less digits than its factorization.

815132540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2618 (or 2616 counting only the distinct ones).

The product of its (nonzero) digits is 4800, while the sum is 29.

The square root of 815132540 is about 28550.5260897238. The cubic root of 815132540 is about 934.1344960512.

The spelling of 815132540 in words is "eight hundred fifteen million, one hundred thirty-two thousand, five hundred forty".