64548640 has 48 divisors (see below), whose sum is σ = 164231928. Its totient is φ = 23832576.

The previous prime is 64548619. The next prime is 64548661. The reversal of 64548640 is 4684546.

It is an interprime number because it is at equal distance from previous prime (64548619) and next prime (64548661).

It can be written as a sum of positive squares in 4 ways, for example, as 45643536 + 18905104 = 6756^2 + 4348^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 64548640.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13437 + ... + 17596.

Almost surely, 2^64548640 is an apocalyptic number.

It is an amenable number.

64548640 is an abundant number, since it is smaller than the sum of its proper divisors (99683288).

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

64548640 is a wasteful number, since it uses less digits than its factorization.

64548640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31061 (or 31053 counting only the distinct ones).

The product of its (nonzero) digits is 92160, while the sum is 37.

The square root of 64548640 is about 8034.2168255531. The cubic root of 64548640 is about 401.1397493441.

The spelling of 64548640 in words is "sixty-four million, five hundred forty-eight thousand, six hundred forty".