621326645 has 8 divisors (see below), whose sum is σ = 769643520. Its totient is φ = 481026960.

The previous prime is 621326639. The next prime is 621326677. The reversal of 621326645 is 546623126.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 621326645 - 2¹² = 621322549 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2004125 + ... + 2004434.

It is an arithmetic number, because the mean of its divisors is an integer number (96205440).

Almost surely, 2^621326645 is an apocalyptic number.

It is an amenable number.

621326645 is a deficient number, since it is larger than the sum of its proper divisors (148316875).

621326645 is a wasteful number, since it uses less digits than its factorization.

621326645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4008595.

The product of its digits is 51840, while the sum is 35.

The square root of 621326645 is about 24926.4246333083. The cubic root of 621326645 is about 853.3096546808.

The spelling of 621326645 in words is "six hundred twenty-one million, three hundred twenty-six thousand, six hundred forty-five".