64801920 has 64 divisors (see below), whose sum is σ = 206562240. Its totient is φ = 17280000.

The previous prime is 64801889. The next prime is 64801949. The reversal of 64801920 is 2910846.

It is a tau number, because it is divible by the number of its divisors (64).

It is a Harshad number since it is a multiple of its sum of digits (30).

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, 14956 + ... + 18795.

It is an arithmetic number, because the mean of its divisors is an integer number (3227535).

Almost surely, 2^64801920 is an apocalyptic number.

64801920 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

64801920 is an abundant number, since it is smaller than the sum of its proper divisors (141760320).

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

64801920 is a wasteful number, since it uses less digits than its factorization.

64801920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33773 (or 33761 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 30.

The square root of 64801920 is about 8049.9639750747. The cubic root of 64801920 is about 401.6637370202.

The spelling of 64801920 in words is "sixty-four million, eight hundred one thousand, nine hundred twenty".