64747891320 has 128 divisors (see below), whose sum is σ = 222589002240. Its totient is φ = 14759769600.

The previous prime is 64747891309. The next prime is 64747891339. The reversal of 64747891320 is 2319874746.

64747891320 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 209995 + ... + 416645.

It is an arithmetic number, because the mean of its divisors is an integer number (1738976580).

Almost surely, 2^64747891320 is an apocalyptic number.

64747891320 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 64747891320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (111294501120).

64747891320 is an abundant number, since it is smaller than the sum of its proper divisors (157841110920).

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

64747891320 is a wasteful number, since it uses less digits than its factorization.

64747891320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 207045 (or 207041 counting only the distinct ones).

The product of its (nonzero) digits is 2032128, while the sum is 51.

The spelling of 64747891320 in words is "sixty-four billion, seven hundred forty-seven million, eight hundred ninety-one thousand, three hundred twenty".