64687824 has 120 divisors (see below), whose sum is σ = 191789312. Its totient is φ = 20321280.

The previous prime is 64687817. The next prime is 64687829. The reversal of 64687824 is 42878646.

It is a self number, because there is not a number n which added to its sum of digits gives 64687824.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64687829) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 191784 + ... + 192120.

Almost surely, 2^64687824 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 64687824, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (95894656).

64687824 is an abundant number, since it is smaller than the sum of its proper divisors (127101488).

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

64687824 is a wasteful number, since it uses less digits than its factorization.

64687824 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 425 (or 416 counting only the distinct ones).

The product of its digits is 516096, while the sum is 45.

The square root of 64687824 is about 8042.8741131513. The cubic root of 64687824 is about 401.4278636156.

The spelling of 64687824 in words is "sixty-four million, six hundred eighty-seven thousand, eight hundred twenty-four".