621401344 has 18 divisors (see below), whose sum is σ = 1240375850. Its totient is φ = 310700544.

The previous prime is 621401321. The next prime is 621401359. The reversal of 621401344 is 443104126.

It can be written as a sum of positive squares in only one way, i.e., 357663744 + 263737600 = 18912^2 + 16240^2 .

It is a super-2 number, since 2×621401344² = 772279260650012672, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1213419 + ... + 1213930.

Almost surely, 2^621401344 is an apocalyptic number.

621401344 is a gapful number since it is divisible by the number (64) formed by its first and last digit.

It is an amenable number.

621401344 is a deficient number, since it is larger than the sum of its proper divisors (618974506).

621401344 is an equidigital number, since it uses as much as digits as its factorization.

621401344 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2427365 (or 2427351 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 25.

The square root of 621401344 is about 24927.9229780582. The cubic root of 621401344 is about 853.3438496968.

The spelling of 621401344 in words is "six hundred twenty-one million, four hundred one thousand, three hundred forty-four".