64528880493 has 64 divisors (see below), whose sum is σ = 108713594880. Its totient is φ = 33348490560.

The previous prime is 64528880417. The next prime is 64528880513. The reversal of 64528880493 is 39408882546.

It is a happy number.

64528880493 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 64528880493 - 2⁸ = 64528880237 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64528880413) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 5500488 + ... + 5512206.

It is an arithmetic number, because the mean of its divisors is an integer number (1698649920).

Almost surely, 2^64528880493 is an apocalyptic number.

It is an amenable number.

64528880493 is a deficient number, since it is larger than the sum of its proper divisors (44184714387).

64528880493 is a wasteful number, since it uses less digits than its factorization.

64528880493 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11959 (or 11937 counting only the distinct ones).

The product of its (nonzero) digits is 13271040, while the sum is 57.

The spelling of 64528880493 in words is "sixty-four billion, five hundred twenty-eight million, eight hundred eighty thousand, four hundred ninety-three".