621911830 has 16 divisors (see below), whose sum is σ = 1126311984. Its totient is φ = 247237920.

The previous prime is 621911809. The next prime is 621911831. The reversal of 621911830 is 38119126.

It is a junction number, because it is equal to n+sod(n) for n = 621911792 and 621911801.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (621911831) 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, 189141 + ... + 192400.

It is an arithmetic number, because the mean of its divisors is an integer number (70394499).

Almost surely, 2^621911830 is an apocalyptic number.

621911830 is a deficient number, since it is larger than the sum of its proper divisors (504400154).

621911830 is a wasteful number, since it uses less digits than its factorization.

621911830 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 381711.

The product of its (nonzero) digits is 2592, while the sum is 31.

The square root of 621911830 is about 24938.1601165764. The cubic root of 621911830 is about 853.5774619232.

The spelling of 621911830 in words is "six hundred twenty-one million, nine hundred eleven thousand, eight hundred thirty".