21768072 has 32 divisors (see below), whose sum is σ = 57285600. Its totient is φ = 6873984.

The previous prime is 21768059. The next prime is 21768101. The reversal of 21768072 is 27086712.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 23413 + ... + 24324.

It is an arithmetic number, because the mean of its divisors is an integer number (1790175).

Almost surely, 2^21768072 is an apocalyptic number.

It is an amenable number.

21768072 is an abundant number, since it is smaller than the sum of its proper divisors (35517528).

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

21768072 is a wasteful number, since it uses less digits than its factorization.

21768072 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47765 (or 47761 counting only the distinct ones).

The product of its (nonzero) digits is 9408, while the sum is 33.

The square root of 21768072 is about 4665.6266460144. The cubic root of 21768072 is about 279.2157989215.

The spelling of 21768072 in words is "twenty-one million, seven hundred sixty-eight thousand, seventy-two".