64434636 has 96 divisors (see below), whose sum is σ = 197568000. Its totient is φ = 17769024.

The previous prime is 64434619. The next prime is 64434659. The reversal of 64434636 is 63643446.

64434636 is a `hidden beast` number, since 644 + 3 + 4 + 6 + 3 + 6 = 666.

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 a self number, because there is not a number n which added to its sum of digits gives 64434636.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 20455 + ... + 23393.

It is an arithmetic number, because the mean of its divisors is an integer number (2058000).

Almost surely, 2^64434636 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 64434636, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (98784000).

64434636 is an abundant number, since it is smaller than the sum of its proper divisors (133133364).

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

64434636 is a wasteful number, since it uses less digits than its factorization.

64434636 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2988 (or 2980 counting only the distinct ones).

The product of its digits is 124416, while the sum is 36.

The square root of 64434636 is about 8027.1187857163. The cubic root of 64434636 is about 400.9034495775.

The spelling of 64434636 in words is "sixty-four million, four hundred thirty-four thousand, six hundred thirty-six".