64463840 has 48 divisors (see below), whose sum is σ = 174055392. Its totient is φ = 22101504.

The previous prime is 64463831. The next prime is 64463873. The reversal of 64463840 is 4836446.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (35).

It is a self number, because there is not a number n which added to its sum of digits gives 64463840.

It is a congruent number.

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, 27659 + ... + 29898.

It is an arithmetic number, because the mean of its divisors is an integer number (3626154).

Almost surely, 2^64463840 is an apocalyptic number.

It is an amenable number.

64463840 is an abundant number, since it is smaller than the sum of its proper divisors (109591552).

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

64463840 is a wasteful number, since it uses less digits than its factorization.

64463840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57579 (or 57571 counting only the distinct ones).

The product of its (nonzero) digits is 55296, while the sum is 35.

The square root of 64463840 is about 8028.9376632279. The cubic root of 64463840 is about 400.9640081875.

The spelling of 64463840 in words is "sixty-four million, four hundred sixty-three thousand, eight hundred forty".