64562640 has 80 divisors (see below), whose sum is σ = 200963328. Its totient is φ = 17146368.

The previous prime is 64562621. The next prime is 64562681. The reversal of 64562640 is 4626546.

64562640 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 (80).

It is a congruent number.

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, 87714 + ... + 88446.

Almost surely, 2^64562640 is an apocalyptic number.

64562640 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 64562640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (100481664).

64562640 is an abundant number, since it is smaller than the sum of its proper divisors (136400688).

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

64562640 is a wasteful number, since it uses less digits than its factorization.

64562640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1116 (or 1110 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 33.

The square root of 64562640 is about 8035.0880517889. The cubic root of 64562640 is about 401.1687484086.

The spelling of 64562640 in words is "sixty-four million, five hundred sixty-two thousand, six hundred forty".