215661036 has 24 divisors (see below), whose sum is σ = 505174320. Its totient is φ = 71606272.

The previous prime is 215661029. The next prime is 215661059. The reversal of 215661036 is 630166512.

It is a junction number, because it is equal to n+sod(n) for n = 215660994 and 215661012.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 31881 + ... + 38048.

It is an arithmetic number, because the mean of its divisors is an integer number (21048930).

Almost surely, 2^215661036 is an apocalyptic number.

It is an amenable number.

215661036 is an abundant number, since it is smaller than the sum of its proper divisors (289513284).

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

215661036 is a wasteful number, since it uses less digits than its factorization.

215661036 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70193 (or 70191 counting only the distinct ones).

The product of its (nonzero) digits is 6480, while the sum is 30.

The square root of 215661036 is about 14685.4021395398. The cubic root of 215661036 is about 599.6859801256.

The spelling of 215661036 in words is "two hundred fifteen million, six hundred sixty-one thousand, thirty-six".