621061904 has 10 divisors (see below), whose sum is σ = 1203307470. Its totient is φ = 310530944.

The previous prime is 621061871. The next prime is 621061933. The reversal of 621061904 is 409160126.

It can be written as a sum of positive squares in only one way, i.e., 418284304 + 202777600 = 20452^2 + 14240^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19408169 + ... + 19408200.

It is an arithmetic number, because the mean of its divisors is an integer number (120330747).

Almost surely, 2^621061904 is an apocalyptic number.

It is an amenable number.

621061904 is a deficient number, since it is larger than the sum of its proper divisors (582245566).

621061904 is a wasteful number, since it uses less digits than its factorization.

621061904 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38816377 (or 38816371 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 29.

The square root of 621061904 is about 24921.1136187772. The cubic root of 621061904 is about 853.1884419252.

The spelling of 621061904 in words is "six hundred twenty-one million, sixty-one thousand, nine hundred four".