621890739 has 24 divisors (see below), whose sum is σ = 915248880. Its totient is φ = 406792512.

The previous prime is 621890713. The next prime is 621890743. The reversal of 621890739 is 937098126.

It is not a de Polignac number, because 621890739 - 2¹⁹ = 621366451 is a prime.

It is a super-2 number, since 2×621890739² = 773496182507932242, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 621890694 and 621890703.

It is not an unprimeable number, because it can be changed into a prime (621890749) 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 in 23 ways as a sum of consecutive naturals, for example, 452257 + ... + 453629.

It is an arithmetic number, because the mean of its divisors is an integer number (38135370).

Almost surely, 2^621890739 is an apocalyptic number.

621890739 is a deficient number, since it is larger than the sum of its proper divisors (293358141).

621890739 is a wasteful number, since it uses less digits than its factorization.

621890739 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2291 (or 2288 counting only the distinct ones).

The product of its (nonzero) digits is 163296, while the sum is 45.

The square root of 621890739 is about 24937.7372469918. The cubic root of 621890739 is about 853.5678126424.

The spelling of 621890739 in words is "six hundred twenty-one million, eight hundred ninety thousand, seven hundred thirty-nine".