1644474372 has 12 divisors (see below), whose sum is σ = 3837106896. Its totient is φ = 548158120.

The previous prime is 1644474367. The next prime is 1644474383. The reversal of 1644474372 is 2734744461.

It is a tau number, because it is divible by the number of its divisors (12).

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 68519754 + ... + 68519777.

It is an arithmetic number, because the mean of its divisors is an integer number (319758908).

Almost surely, 2^1644474372 is an apocalyptic number.

1644474372 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1644474372 is an abundant number, since it is smaller than the sum of its proper divisors (2192632524).

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

1644474372 is a wasteful number, since it uses less digits than its factorization.

1644474372 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 137039538 (or 137039536 counting only the distinct ones).

The product of its digits is 451584, while the sum is 42.

The square root of 1644474372 is about 40552.1192047962. The cubic root of 1644474372 is about 1180.3451953780.

It can be divided in two parts, 164 and 4474372, that added together give a triangular number (4474536 = T₂₉₉₁).

The spelling of 1644474372 in words is "one billion, six hundred forty-four million, four hundred seventy-four thousand, three hundred seventy-two".