621061906 has 8 divisors (see below), whose sum is σ = 931860864. Its totient is φ = 310441620.

The previous prime is 621061871. The next prime is 621061933. The reversal of 621061906 is 609160126.

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

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 35610 + ... + 50101.

It is an arithmetic number, because the mean of its divisors is an integer number (116482608).

Almost surely, 2^621061906 is an apocalyptic number.

621061906 is a deficient number, since it is larger than the sum of its proper divisors (310798958).

621061906 is a wasteful number, since it uses less digits than its factorization.

621061906 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 89336.

The product of its (nonzero) digits is 3888, while the sum is 31.

The square root of 621061906 is about 24921.1136589038. The cubic root of 621061906 is about 853.1884428411.

The spelling of 621061906 in words is "six hundred twenty-one million, sixty-one thousand, nine hundred six".