215231064 has 16 divisors (see below), whose sum is σ = 538077720. Its totient is φ = 71743680.

The previous prime is 215231059. The next prime is 215231087. The reversal of 215231064 is 460132512.

It is a Harshad number since it is a multiple of its sum of digits (24), and also a Moran number because the ratio is a prime number: 8967961 = 215231064 / (2 + 1 + 5 + 2 + 3 + 1 + 0 + 6 + 4).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4483957 + ... + 4484004.

Almost surely, 2^215231064 is an apocalyptic number.

215231064 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

215231064 is an abundant number, since it is smaller than the sum of its proper divisors (322846656).

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

215231064 is a wasteful number, since it uses less digits than its factorization.

215231064 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8967970 (or 8967966 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 24.

The square root of 215231064 is about 14670.7553997741. The cubic root of 215231064 is about 599.2871756934.

Adding to 215231064 its reverse (460132512), we get a palindrome (675363576).

The spelling of 215231064 in words is "two hundred fifteen million, two hundred thirty-one thousand, sixty-four".