64642824 has 24 divisors (see below), whose sum is σ = 175074510. Its totient is φ = 21547584.

The previous prime is 64642771. The next prime is 64642829. The reversal of 64642824 is 42824646.

It is a happy number.

64642824 is a `hidden beast` number, since 6 + 4 + 642 + 8 + 2 + 4 = 666.

It can be written as a sum of positive squares in only one way, i.e., 56520324 + 8122500 = 7518^2 + 2850^2 .

It is a tau number, because it is divible by the number of its divisors (24).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a nude number because it is divisible by every one of its digits.

It is not an unprimeable number, because it can be changed into a prime (64642829) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 448837 + ... + 448980.

Almost surely, 2^64642824 is an apocalyptic number.

It is an amenable number.

64642824 is an abundant number, since it is smaller than the sum of its proper divisors (110431686).

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

64642824 is a wasteful number, since it uses less digits than its factorization.

64642824 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 897829 (or 897822 counting only the distinct ones).

The product of its digits is 73728, while the sum is 36.

The square root of 64642824 is about 8040.0761190427. The cubic root of 64642824 is about 401.3347577668.

The spelling of 64642824 in words is "sixty-four million, six hundred forty-two thousand, eight hundred twenty-four".