644789147070 has 32 divisors (see below), whose sum is σ = 1551169740960. Its totient is φ = 171535351680.

The previous prime is 644789147063. The next prime is 644789147087. The reversal of 644789147070 is 70741987446.

644789147070 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a self number, because there is not a number n which added to its sum of digits gives 644789147070.

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, 25513465 + ... + 25538724.

It is an arithmetic number, because the mean of its divisors is an integer number (48474054405).

Almost surely, 2^644789147070 is an apocalyptic number.

644789147070 is an abundant number, since it is smaller than the sum of its proper divisors (906380593890).

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

644789147070 is a wasteful number, since it uses less digits than its factorization.

644789147070 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51052620.

The product of its (nonzero) digits is 9483264, while the sum is 57.

The spelling of 644789147070 in words is "six hundred forty-four billion, seven hundred eighty-nine million, one hundred forty-seven thousand, seventy".