64020880 has 160 divisors (see below), whose sum is σ = 195701760. Its totient is φ = 18869760.

The previous prime is 64020871. The next prime is 64020881. The reversal of 64020880 is 8802046.

It is a Harshad number since it is a multiple of its sum of digits (28).

It is not an unprimeable number, because it can be changed into a prime (64020881) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 116767 + ... + 117313.

It is an arithmetic number, because the mean of its divisors is an integer number (1223136).

Almost surely, 2^64020880 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 64020880, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (97850880).

64020880 is an abundant number, since it is smaller than the sum of its proper divisors (131680880).

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

64020880 is a wasteful number, since it uses less digits than its factorization.

64020880 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 597 (or 591 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 28.

The square root of 64020880 is about 8001.3048935783. The cubic root of 64020880 is about 400.0434952702.

The spelling of 64020880 in words is "sixty-four million, twenty thousand, eight hundred eighty".