621601964 has 6 divisors (see below), whose sum is σ = 1087803444. Its totient is φ = 310800980.

The previous prime is 621601927. The next prime is 621601969. The reversal of 621601964 is 469106126.

It is not an unprimeable number, because it can be changed into a prime (621601969) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 77700242 + ... + 77700249.

It is an arithmetic number, because the mean of its divisors is an integer number (181300574).

Almost surely, 2^621601964 is an apocalyptic number.

It is an amenable number.

621601964 is a deficient number, since it is larger than the sum of its proper divisors (466201480).

621601964 is a wasteful number, since it uses less digits than its factorization.

621601964 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 155400495 (or 155400493 counting only the distinct ones).

The product of its (nonzero) digits is 15552, while the sum is 35.

The square root of 621601964 is about 24931.9466548443. The cubic root of 621601964 is about 853.4356741000.

The spelling of 621601964 in words is "six hundred twenty-one million, six hundred one thousand, nine hundred sixty-four".