215135640 has 48 divisors (see below), whose sum is σ = 699192000. Its totient is φ = 57369408.

The previous prime is 215135633. The next prime is 215135681. The reversal of 215135640 is 46531512.

215135640 is a `hidden beast` number, since 2 + 1 + 5 + 13 + 5 + 640 = 666.

215135640 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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, 298440 + ... + 299159.

It is an arithmetic number, because the mean of its divisors is an integer number (14566500).

Almost surely, 2^215135640 is an apocalyptic number.

215135640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

215135640 is an abundant number, since it is smaller than the sum of its proper divisors (484056360).

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

215135640 is a wasteful number, since it uses less digits than its factorization.

215135640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 597616 (or 597609 counting only the distinct ones).

The product of its (nonzero) digits is 3600, while the sum is 27.

The square root of 215135640 is about 14667.5028549511. The cubic root of 215135640 is about 599.1985967312.

The spelling of 215135640 in words is "two hundred fifteen million, one hundred thirty-five thousand, six hundred forty".