621564476 has 12 divisors (see below), whose sum is σ = 1171410072. Its totient is φ = 286875888.

The previous prime is 621564473. The next prime is 621564487. The reversal of 621564476 is 674465126.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (621564473) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5976530 + ... + 5976633.

It is an arithmetic number, because the mean of its divisors is an integer number (97617506).

Almost surely, 2^621564476 is an apocalyptic number.

It is an amenable number.

621564476 is a deficient number, since it is larger than the sum of its proper divisors (549845596).

621564476 is a wasteful number, since it uses less digits than its factorization.

621564476 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11953180 (or 11953178 counting only the distinct ones).

The product of its digits is 241920, while the sum is 41.

The square root of 621564476 is about 24931.1948369909. The cubic root of 621564476 is about 853.4185172260.

The spelling of 621564476 in words is "six hundred twenty-one million, five hundred sixty-four thousand, four hundred seventy-six".