621090794 has 4 divisors (see below), whose sum is σ = 931636194. Its totient is φ = 310545396.

The previous prime is 621090793. The next prime is 621090857. The reversal of 621090794 is 497090126.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 436266769 + 184824025 = 20887^2 + 13595^2 .

It is not an unprimeable number, because it can be changed into a prime (621090793) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 155272697 + ... + 155272700.

Almost surely, 2^621090794 is an apocalyptic number.

621090794 is a deficient number, since it is larger than the sum of its proper divisors (310545400).

621090794 is a wasteful number, since it uses less digits than its factorization.

621090794 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 310545399.

The product of its (nonzero) digits is 27216, while the sum is 38.

The square root of 621090794 is about 24921.6932410300. The cubic root of 621090794 is about 853.2016710047.

The spelling of 621090794 in words is "six hundred twenty-one million, ninety thousand, seven hundred ninety-four".