18648072 has 24 divisors (see below), whose sum is σ = 50505390. Its totient is φ = 6216000.

The previous prime is 18648061. The next prime is 18648083. The reversal of 18648072 is 27084681.

18648072 is a `hidden beast` number, since 1 + 8 + 648 + 0 + 7 + 2 = 666.

It is an interprime number because it is at equal distance from previous prime (18648061) and next prime (18648083).

It can be written as a sum of positive squares in only one way, i.e., 12916836 + 5731236 = 3594^2 + 2394^2 .

It is a tau number, because it is divible by the number of its divisors (24).

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

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 129429 + ... + 129572.

Almost surely, 2^18648072 is an apocalyptic number.

18648072 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

18648072 is an abundant number, since it is smaller than the sum of its proper divisors (31857318).

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

18648072 is a wasteful number, since it uses less digits than its factorization.

18648072 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 259013 (or 259006 counting only the distinct ones).

The product of its (nonzero) digits is 21504, while the sum is 36.

The square root of 18648072 is about 4318.3413482493. The cubic root of 18648072 is about 265.1823688312.

The spelling of 18648072 in words is "eighteen million, six hundred forty-eight thousand, seventy-two".