621818894 has 24 divisors (see below), whose sum is σ = 1020533904. Its totient is φ = 283166400.

The previous prime is 621818887. The next prime is 621818903. The reversal of 621818894 is 498818126.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 23159 + ... + 42189.

It is an arithmetic number, because the mean of its divisors is an integer number (42522246).

Almost surely, 2^621818894 is an apocalyptic number.

621818894 is a deficient number, since it is larger than the sum of its proper divisors (398715010).

621818894 is a wasteful number, since it uses less digits than its factorization.

621818894 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19112 (or 19081 counting only the distinct ones).

The product of its digits is 221184, while the sum is 47.

The square root of 621818894 is about 24936.2967178368. The cubic root of 621818894 is about 853.5349414120.

The spelling of 621818894 in words is "six hundred twenty-one million, eight hundred eighteen thousand, eight hundred ninety-four".