621682906 has 16 divisors (see below), whose sum is σ = 1027613664. Its totient is φ = 280257264.

The previous prime is 621682871. The next prime is 621682909. The reversal of 621682906 is 609286126.

It is a happy number.

It is a super-2 number, since 2×621682906² = 772979271225209672, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (621682909) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 276916 + ... + 279151.

It is an arithmetic number, because the mean of its divisors is an integer number (64225854).

Almost surely, 2^621682906 is an apocalyptic number.

621682906 is a deficient number, since it is larger than the sum of its proper divisors (405930758).

621682906 is a wasteful number, since it uses less digits than its factorization.

621682906 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 556125.

The product of its (nonzero) digits is 62208, while the sum is 40.

The square root of 621682906 is about 24933.5698607319. The cubic root of 621682906 is about 853.4727159135.

The spelling of 621682906 in words is "six hundred twenty-one million, six hundred eighty-two thousand, nine hundred six".