1644472957 has 8 divisors (see below), whose sum is σ = 1673534880. Its totient is φ = 1615450800.

The previous prime is 1644472939. The next prime is 1644472967. The reversal of 1644472957 is 7592744461.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1644472957 - 2⁷ = 1644472829 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1644472957.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1644472967) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 80707 + ... + 99007.

It is an arithmetic number, because the mean of its divisors is an integer number (209191860).

Almost surely, 2^1644472957 is an apocalyptic number.

It is an amenable number.

1644472957 is a deficient number, since it is larger than the sum of its proper divisors (29061923).

1644472957 is a wasteful number, since it uses less digits than its factorization.

1644472957 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19883.

The product of its digits is 1693440, while the sum is 49.

The square root of 1644472957 is about 40552.1017581087. The cubic root of 1644472957 is about 1180.3448568324.

It can be divided in two parts, 16444 and 72957, that added together give a square (89401 = 299²).

The spelling of 1644472957 in words is "one billion, six hundred forty-four million, four hundred seventy-two thousand, nine hundred fifty-seven".