621347679 has 20 divisors (see below), whose sum is σ = 929171584. Its totient is φ = 413792064.

The previous prime is 621347677. The next prime is 621347681. The reversal of 621347679 is 976743126.

It is an interprime number because it is at equal distance from previous prime (621347677) and next prime (621347681).

It is not a de Polignac number, because 621347679 - 2¹ = 621347677 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (621347677) 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 19 ways as a sum of consecutive naturals, for example, 84519 + ... + 91575.

Almost surely, 2^621347679 is an apocalyptic number.

621347679 is a deficient number, since it is larger than the sum of its proper divisors (307823905).

621347679 is a wasteful number, since it uses less digits than its factorization.

621347679 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8156 (or 8147 counting only the distinct ones).

The product of its digits is 381024, while the sum is 45.

The square root of 621347679 is about 24926.8465514593. The cubic root of 621347679 is about 853.3192837076.

The spelling of 621347679 in words is "six hundred twenty-one million, three hundred forty-seven thousand, six hundred seventy-nine".