64890560 has 112 divisors (see below), whose sum is σ = 179953920. Its totient is φ = 21826560.

The previous prime is 64890559. The next prime is 64890583. The reversal of 64890560 is 6509846.

64890560 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (112).

It is a super-2 number, since 2×64890560² = 8421569554227200, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 131915 + ... + 132405.

Almost surely, 2^64890560 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 64890560, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (89976960).

64890560 is an abundant number, since it is smaller than the sum of its proper divisors (115063360).

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

64890560 is a wasteful number, since it uses less digits than its factorization.

64890560 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 574 (or 564 counting only the distinct ones).

The product of its (nonzero) digits is 51840, while the sum is 38.

The square root of 64890560 is about 8055.4677083333. The cubic root of 64890560 is about 401.8467935945.

The spelling of 64890560 in words is "sixty-four million, eight hundred ninety thousand, five hundred sixty".