64881320 has 32 divisors (see below), whose sum is σ = 166838400. Its totient is φ = 22244928.

The previous prime is 64881317. The next prime is 64881331. The reversal of 64881320 is 2318846.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 115580 + ... + 116139.

It is an arithmetic number, because the mean of its divisors is an integer number (5213700).

Almost surely, 2^64881320 is an apocalyptic number.

It is an amenable number.

64881320 is an abundant number, since it is smaller than the sum of its proper divisors (101957080).

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

64881320 is a wasteful number, since it uses less digits than its factorization.

64881320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 231737 (or 231733 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 32.

The square root of 64881320 is about 8054.8941644195. The cubic root of 64881320 is about 401.8277192195.

The spelling of 64881320 in words is "sixty-four million, eight hundred eighty-one thousand, three hundred twenty".