621633434 has 4 divisors (see below), whose sum is σ = 932450154. Its totient is φ = 310816716.

The previous prime is 621633409. The next prime is 621633451. The reversal of 621633434 is 434336126.

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., 599515225 + 22118209 = 24485^2 + 4703^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 621633434.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 155408357 + ... + 155408360.

Almost surely, 2^621633434 is an apocalyptic number.

621633434 is a deficient number, since it is larger than the sum of its proper divisors (310816720).

621633434 is a wasteful number, since it uses less digits than its factorization.

621633434 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 310816719.

The product of its digits is 31104, while the sum is 32.

The square root of 621633434 is about 24932.5777648441. The cubic root of 621633434 is about 853.4500762249.

The spelling of 621633434 in words is "six hundred twenty-one million, six hundred thirty-three thousand, four hundred thirty-four".