64625840 has 160 divisors (see below), whose sum is σ = 174363840. Its totient is φ = 22118400.

The previous prime is 64625831. The next prime is 64625851. The reversal of 64625840 is 4852646.

64625840 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a self number, because there is not a number n which added to its sum of digits gives 64625840.

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 31 ways as a sum of consecutive naturals, for example, 1059410 + ... + 1059470.

It is an arithmetic number, because the mean of its divisors is an integer number (1089774).

Almost surely, 2^64625840 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 64625840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (87181920).

64625840 is an abundant number, since it is smaller than the sum of its proper divisors (109738000).

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

64625840 is a wasteful number, since it uses less digits than its factorization.

64625840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 151 (or 145 counting only the distinct ones).

The product of its (nonzero) digits is 46080, while the sum is 35.

The square root of 64625840 is about 8039.0198407517. The cubic root of 64625840 is about 401.2996063189.

The spelling of 64625840 in words is "sixty-four million, six hundred twenty-five thousand, eight hundred forty".