64398338520 has 64 divisors (see below), whose sum is σ = 204559434720. Its totient is φ = 16162719744.

The previous prime is 64398338519. The next prime is 64398338531. The reversal of 64398338520 is 2583389346.

It is a Harshad number since it is a multiple of its sum of digits (51).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 15781867 + ... + 15785946.

Almost surely, 2^64398338520 is an apocalyptic number.

64398338520 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

64398338520 is an abundant number, since it is smaller than the sum of its proper divisors (140161096200).

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

64398338520 is a wasteful number, since it uses less digits than its factorization.

64398338520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31567844 (or 31567840 counting only the distinct ones).

The product of its (nonzero) digits is 3732480, while the sum is 51.

The spelling of 64398338520 in words is "sixty-four billion, three hundred ninety-eight million, three hundred thirty-eight thousand, five hundred twenty".