64881960 has 256 divisors, whose sum is σ = 241920000. Its totient is φ = 13685760.

The previous prime is 64881959. The next prime is 64881991. The reversal of 64881960 is 6918846.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 325941 + ... + 326139.

It is an arithmetic number, because the mean of its divisors is an integer number (945000).

Almost surely, 2^64881960 is an apocalyptic number.

64881960 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 64881960, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (120960000).

64881960 is an abundant number, since it is smaller than the sum of its proper divisors (177038040).

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

64881960 is a wasteful number, since it uses less digits than its factorization.

64881960 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 256 (or 252 counting only the distinct ones).

The product of its (nonzero) digits is 82944, while the sum is 42.

The square root of 64881960 is about 8054.9338917213. The cubic root of 64881960 is about 401.8290404467.

It can be divided in two parts, 6488 and 1960, that added together give a palindrome (8448).

The spelling of 64881960 in words is "sixty-four million, eight hundred eighty-one thousand, nine hundred sixty".