644048496 has 400 divisors, whose sum is σ = 2366070784. Its totient is φ = 164602368.

The previous prime is 644048479. The next prime is 644048521. The reversal of 644048496 is 694840446.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 5071185 + ... + 5071311.

Almost surely, 2^644048496 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 644048496, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1183035392).

644048496 is an abundant number, since it is smaller than the sum of its proper divisors (1722022288).

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

644048496 is a wasteful number, since it uses less digits than its factorization.

644048496 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 210 (or 195 counting only the distinct ones).

The product of its (nonzero) digits is 663552, while the sum is 45.

The square root of 644048496 is about 25378.1105679678. The cubic root of 644048496 is about 863.5871870516.

It can be divided in two parts, 64404 and 8496, that added together give a square (72900 = 270²).

The spelling of 644048496 in words is "six hundred forty-four million, forty-eight thousand, four hundred ninety-six".