644160532 has 48 divisors (see below), whose sum is σ = 1236695040. Its totient is φ = 292262400.

The previous prime is 644160497. The next prime is 644160571. The reversal of 644160532 is 235061446.

It is a Harshad number since it is a multiple of its sum of digits (31).

It is a junction number, because it is equal to n+sod(n) for n = 644160494 and 644160503.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 908194 + ... + 908902.

It is an arithmetic number, because the mean of its divisors is an integer number (25764480).

Almost surely, 2^644160532 is an apocalyptic number.

644160532 is a gapful number since it is divisible by the number (62) formed by its first and last digit.

It is an amenable number.

644160532 is a deficient number, since it is larger than the sum of its proper divisors (592534508).

644160532 is a wasteful number, since it uses less digits than its factorization.

644160532 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1192 (or 1190 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 31.

The square root of 644160532 is about 25380.3178073089. The cubic root of 644160532 is about 863.6372594944.

The spelling of 644160532 in words is "six hundred forty-four million, one hundred sixty thousand, five hundred thirty-two".