215089640 has 32 divisors (see below), whose sum is σ = 484927560. Its totient is φ = 85862400.

The previous prime is 215089619. The next prime is 215089673. The reversal of 215089640 is 46980512.

It can be written as a sum of positive squares in 4 ways, for example, as 157602916 + 57486724 = 12554^2 + 7582^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 215089640.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15680 + ... + 26000.

Almost surely, 2^215089640 is an apocalyptic number.

215089640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

215089640 is an abundant number, since it is smaller than the sum of its proper divisors (269837920).

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

215089640 is a wasteful number, since it uses less digits than its factorization.

215089640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10853 (or 10849 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 35.

The square root of 215089640 is about 14665.9346787036. The cubic root of 215089640 is about 599.1558870866.

The spelling of 215089640 in words is "two hundred fifteen million, eighty-nine thousand, six hundred forty".