215672940 has 72 divisors (see below), whose sum is σ = 747670560. Its totient is φ = 49296384.

The previous prime is 215672929. The next prime is 215673011. The reversal of 215672940 is 49276512.

215672940 is a `hidden beast` number, since 2 + 1 + 567 + 2 + 94 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 215672895 and 215672904.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 84325 + ... + 86844.

Almost surely, 2^215672940 is an apocalyptic number.

215672940 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

215672940 is an abundant number, since it is smaller than the sum of its proper divisors (531997620).

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

215672940 is a wasteful number, since it uses less digits than its factorization.

215672940 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 171191 (or 171186 counting only the distinct ones).

The product of its (nonzero) digits is 30240, while the sum is 36.

The square root of 215672940 is about 14685.8074343905. The cubic root of 215672940 is about 599.6970136912.

It can be divided in two parts, 215672 and 940, that added together give a palindrome (216612).

The spelling of 215672940 in words is "two hundred fifteen million, six hundred seventy-two thousand, nine hundred forty".