644328594090 has 48 divisors (see below), whose sum is σ = 1675946308608. Its totient is φ = 171749987808.

The previous prime is 644328594079. The next prime is 644328594113. The reversal of 644328594090 is 90495823446.

644328594090 is a `hidden beast` number, since 6 + 4 + 43 + 2 + 8 + 594 + 0 + 9 + 0 = 666.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1259274 + ... + 1695413.

It is an arithmetic number, because the mean of its divisors is an integer number (34915548096).

Almost surely, 2^644328594090 is an apocalyptic number.

644328594090 is an abundant number, since it is smaller than the sum of its proper divisors (1031617714518).

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

644328594090 is a wasteful number, since it uses less digits than its factorization.

644328594090 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2957123 (or 2957120 counting only the distinct ones).

The product of its (nonzero) digits is 7464960, while the sum is 54.

The spelling of 644328594090 in words is "six hundred forty-four billion, three hundred twenty-eight million, five hundred ninety-four thousand, ninety".