644167472 has 20 divisors (see below), whose sum is σ = 1344080640. Its totient is φ = 297307968.

The previous prime is 644167471. The next prime is 644167481. The reversal of 644167472 is 274761446.

It is not an unprimeable number, because it can be changed into a prime (644167471) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1548272 + ... + 1548687.

It is an arithmetic number, because the mean of its divisors is an integer number (67204032).

Almost surely, 2^644167472 is an apocalyptic number.

It is an amenable number.

644167472 is an abundant number, since it is smaller than the sum of its proper divisors (699913168).

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

644167472 is a wasteful number, since it uses less digits than its factorization.

644167472 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3096980 (or 3096974 counting only the distinct ones).

The product of its digits is 225792, while the sum is 41.

The square root of 644167472 is about 25380.4545270568. The cubic root of 644167472 is about 863.6403610096.

The spelling of 644167472 in words is "six hundred forty-four million, one hundred sixty-seven thousand, four hundred seventy-two".