621136506 has 16 divisors (see below), whose sum is σ = 1244486304. Its totient is φ = 206676624.

The previous prime is 621136499. The next prime is 621136507. The reversal of 621136506 is 605631126.

It is not an unprimeable number, because it can be changed into a prime (621136507) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 88561 + ... + 95316.

It is an arithmetic number, because the mean of its divisors is an integer number (77780394).

Almost surely, 2^621136506 is an apocalyptic number.

621136506 is an abundant number, since it is smaller than the sum of its proper divisors (623349798).

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

621136506 is a wasteful number, since it uses less digits than its factorization.

621136506 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 184445.

The product of its (nonzero) digits is 6480, while the sum is 30.

The square root of 621136506 is about 24922.6103368006. The cubic root of 621136506 is about 853.2226022429. Note that the first 3 decimals are identical.

The spelling of 621136506 in words is "six hundred twenty-one million, one hundred thirty-six thousand, five hundred six".