64726357320 has 96 divisors (see below), whose sum is σ = 211120411320. Its totient is φ = 17198023680.

The previous prime is 64726357307. The next prime is 64726357321. The reversal of 64726357320 is 2375362746.

64726357320 is a `hidden beast` number, since 6 + 4 + 7 + 2 + 635 + 7 + 3 + 2 + 0 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 18336951396 + 46389405924 = 135414^2 + 215382^2 .

It is a Harshad number since it is a multiple of its sum of digits (45).

It is not an unprimeable number, because it can be changed into a prime (64726357321) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 224821 + ... + 424260.

Almost surely, 2^64726357320 is an apocalyptic number.

64726357320 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

64726357320 is an abundant number, since it is smaller than the sum of its proper divisors (146394054000).

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

64726357320 is a wasteful number, since it uses less digits than its factorization.

64726357320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 649375 (or 649368 counting only the distinct ones).

The product of its (nonzero) digits is 1270080, while the sum is 45.

The spelling of 64726357320 in words is "sixty-four billion, seven hundred twenty-six million, three hundred fifty-seven thousand, three hundred twenty".