64490312800 has 36 divisors (see below), whose sum is σ = 157436978076. Its totient is φ = 25796124800.

The previous prime is 64490312771. The next prime is 64490312807. The reversal of 64490312800 is 821309446.

It is a self number, because there is not a number n which added to its sum of digits gives 64490312800.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64490312807) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 40305646 + ... + 40307245.

It is an arithmetic number, because the mean of its divisors is an integer number (4373249391).

Almost surely, 2^64490312800 is an apocalyptic number.

It is an amenable number.

64490312800 is an abundant number, since it is smaller than the sum of its proper divisors (92946665276).

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

64490312800 is a wasteful number, since it uses less digits than its factorization.

64490312800 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80612911 (or 80612898 counting only the distinct ones).

The product of its (nonzero) digits is 41472, while the sum is 37.

The spelling of 64490312800 in words is "sixty-four billion, four hundred ninety million, three hundred twelve thousand, eight hundred".