64801520 has 120 divisors (see below), whose sum is σ = 178792128. Its totient is φ = 21772800.

The previous prime is 64801519. The next prime is 64801531. The reversal of 64801520 is 2510846.

It is a self number, because there is not a number n which added to its sum of digits gives 64801520.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 238985 + ... + 239255.

Almost surely, 2^64801520 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 64801520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (89396064).

64801520 is an abundant number, since it is smaller than the sum of its proper divisors (113990608).

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

64801520 is a wasteful number, since it uses less digits than its factorization.

64801520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 359 (or 346 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 26.

The square root of 64801520 is about 8049.9391302047. The cubic root of 64801520 is about 401.6629105744.

It can be divided in two parts, 6480 and 1520, that added together give a cube (8000 = 20³).

The spelling of 64801520 in words is "sixty-four million, eight hundred one thousand, five hundred twenty".