215284640 has 48 divisors (see below), whose sum is σ = 509537952. Its totient is φ = 85956864.

The previous prime is 215284633. The next prime is 215284679. The reversal of 215284640 is 46482512.

It is a Harshad number since it is a multiple of its sum of digits (32).

It is a junction number, because it is equal to n+sod(n) for n = 215284597 and 215284606.

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, 131507 + ... + 133133.

It is an arithmetic number, because the mean of its divisors is an integer number (10615374).

Almost surely, 2^215284640 is an apocalyptic number.

215284640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

215284640 is an abundant number, since it is smaller than the sum of its proper divisors (294253312).

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

215284640 is a wasteful number, since it uses less digits than its factorization.

215284640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2469 (or 2461 counting only the distinct ones).

The product of its (nonzero) digits is 15360, while the sum is 32.

The square root of 215284640 is about 14672.5812316715. The cubic root of 215284640 is about 599.3368970571.

The spelling of 215284640 in words is "two hundred fifteen million, two hundred eighty-four thousand, six hundred forty".