64812636 has 180 divisors, whose sum is σ = 210150864. Its totient is φ = 17003520.

The previous prime is 64812611. The next prime is 64812637. The reversal of 64812636 is 63621846.

64812636 = 61³ + 62³ + ... + 128³.

64812636 is a `hidden beast` number, since 6 + 4 + 8 + 12 + 636 = 666.

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

It is a self number, because there is not a number n which added to its sum of digits gives 64812636.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64812637) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 59 ways as a sum of consecutive naturals, for example, 1580776 + ... + 1580816.

Almost surely, 2^64812636 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 64812636, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (105075432).

64812636 is an abundant number, since it is smaller than the sum of its proper divisors (145338228).

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

64812636 is a wasteful number, since it uses less digits than its factorization.

64812636 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 122 (or 70 counting only the distinct ones).

The product of its digits is 41472, while the sum is 36.

The square root of 64812636 is about 8050.6295406012. The cubic root of 64812636 is about 401.6858762375.

The spelling of 64812636 in words is "sixty-four million, eight hundred twelve thousand, six hundred thirty-six".