16215864 has 48 divisors (see below), whose sum is σ = 47161800. Its totient is φ = 4632768.

The previous prime is 16215863. The next prime is 16215887. The reversal of 16215864 is 46851261.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16215863) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5719 + ... + 8070.

Almost surely, 2^16215864 is an apocalyptic number.

16215864 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

16215864 is an abundant number, since it is smaller than the sum of its proper divisors (30945936).

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

16215864 is a wasteful number, since it uses less digits than its factorization.

16215864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13812 (or 13801 counting only the distinct ones).

The product of its digits is 11520, while the sum is 33.

The square root of 16215864 is about 4026.8925985181. The cubic root of 16215864 is about 253.1123665696.

The spelling of 16215864 in words is "sixteen million, two hundred fifteen thousand, eight hundred sixty-four".