1644008364 has 36 divisors (see below), whose sum is σ = 4374410040. Its totient is φ = 519160320.

The previous prime is 1644008351. The next prime is 1644008371. The reversal of 1644008364 is 4638004461.

1644008364 is a `hidden beast` number, since 1 + 644 + 0 + 0 + 8 + 3 + 6 + 4 = 666.

It is a tau number, because it is divible by the number of its divisors (36).

It is a super-3 number, since 3×1644008364³ (a number of 29 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1201077 + ... + 1202444.

It is an arithmetic number, because the mean of its divisors is an integer number (121511390).

Almost surely, 2^1644008364 is an apocalyptic number.

It is an amenable number.

1644008364 is an abundant number, since it is smaller than the sum of its proper divisors (2730401676).

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

1644008364 is a wasteful number, since it uses less digits than its factorization.

1644008364 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2403550 (or 2403545 counting only the distinct ones).

The product of its (nonzero) digits is 55296, while the sum is 36.

The square root of 1644008364 is about 40546.3730067191. The cubic root of 1644008364 is about 1180.2336901905.

The spelling of 1644008364 in words is "one billion, six hundred forty-four million, eight thousand, three hundred sixty-four".