621696424 has 8 divisors (see below), whose sum is σ = 1165680810. Its totient is φ = 310848208.

The previous prime is 621696421. The next prime is 621696437. The reversal of 621696424 is 424696126.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 615536100 + 6160324 = 24810^2 + 2482^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a super-2 number, since 2×621696424² = 773012887228775552, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (621696421) 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, 38856019 + ... + 38856034.

Almost surely, 2^621696424 is an apocalyptic number.

It is an amenable number.

621696424 is a deficient number, since it is larger than the sum of its proper divisors (543984386).

621696424 is a wasteful number, since it uses less digits than its factorization.

621696424 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 77712059 (or 77712055 counting only the distinct ones).

The product of its digits is 124416, while the sum is 40.

The square root of 621696424 is about 24933.8409395745. The cubic root of 621696424 is about 853.4789018970.

The spelling of 621696424 in words is "six hundred twenty-one million, six hundred ninety-six thousand, four hundred twenty-four".