2221664928 has 48 divisors (see below), whose sum is σ = 6664996800. Its totient is φ = 634761216.

The previous prime is 2221664899. The next prime is 2221664933. The reversal of 2221664928 is 8294661222.

It is a tau number, because it is divible by the number of its divisors (48).

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a self number, because there is not a number n which added to its sum of digits gives 2221664928.

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, 1652353 + ... + 1653696.

It is an arithmetic number, because the mean of its divisors is an integer number (138854100).

Almost surely, 2^2221664928 is an apocalyptic number.

2221664928 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

2221664928 is an abundant number, since it is smaller than the sum of its proper divisors (4443331872).

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

2221664928 is a wasteful number, since it uses less digits than its factorization.

2221664928 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3306069 (or 3306061 counting only the distinct ones).

The product of its digits is 165888, while the sum is 42.

The square root of 2221664928 is about 47134.5407106084. The cubic root of 2221664928 is about 1304.8467846135.

The spelling of 2221664928 in words is "two billion, two hundred twenty-one million, six hundred sixty-four thousand, nine hundred twenty-eight".