215137964 has 6 divisors (see below), whose sum is σ = 376491444. Its totient is φ = 107568980.

The previous prime is 215137963. The next prime is 215137981. The reversal of 215137964 is 469731512.

It is not an unprimeable number, because it can be changed into a prime (215137963) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 26892242 + ... + 26892249.

It is an arithmetic number, because the mean of its divisors is an integer number (62748574).

Almost surely, 2^215137964 is an apocalyptic number.

It is an amenable number.

215137964 is a deficient number, since it is larger than the sum of its proper divisors (161353480).

215137964 is a wasteful number, since it uses less digits than its factorization.

215137964 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53784495 (or 53784493 counting only the distinct ones).

The product of its digits is 45360, while the sum is 38.

The square root of 215137964 is about 14667.5820774932. The cubic root of 215137964 is about 599.2007543352.

The spelling of 215137964 in words is "two hundred fifteen million, one hundred thirty-seven thousand, nine hundred sixty-four".