621194636 has 6 divisors (see below), whose sum is σ = 1087090620. Its totient is φ = 310597316.

The previous prime is 621194633. The next prime is 621194669. The reversal of 621194636 is 636491126.

It is a self number, because there is not a number n which added to its sum of digits gives 621194636.

It is not an unprimeable number, because it can be changed into a prime (621194633) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 77649326 + ... + 77649333.

It is an arithmetic number, because the mean of its divisors is an integer number (181181770).

Almost surely, 2^621194636 is an apocalyptic number.

It is an amenable number.

621194636 is a deficient number, since it is larger than the sum of its proper divisors (465895984).

621194636 is a wasteful number, since it uses less digits than its factorization.

621194636 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 155298663 (or 155298661 counting only the distinct ones).

The product of its digits is 46656, while the sum is 38.

The square root of 621194636 is about 24923.7765196208. The cubic root of 621194636 is about 853.2492181221.

The spelling of 621194636 in words is "six hundred twenty-one million, one hundred ninety-four thousand, six hundred thirty-six".