64826571720 has 128 divisors (see below), whose sum is σ = 199165132800. Its totient is φ = 16872635136.

The previous prime is 64826571709. The next prime is 64826571763. The reversal of 64826571720 is 2717562846.

It is a self number, because there is not a number n which added to its sum of digits gives 64826571720.

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, 2054221 + ... + 2085539.

It is an arithmetic number, because the mean of its divisors is an integer number (1555977600).

Almost surely, 2^64826571720 is an apocalyptic number.

64826571720 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 64826571720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (99582566400).

64826571720 is an abundant number, since it is smaller than the sum of its proper divisors (134338561080).

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

64826571720 is a wasteful number, since it uses less digits than its factorization.

64826571720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31747 (or 31743 counting only the distinct ones).

The product of its (nonzero) digits is 1128960, while the sum is 48.

The spelling of 64826571720 in words is "sixty-four billion, eight hundred twenty-six million, five hundred seventy-one thousand, seven hundred twenty".