621923718 has 24 divisors (see below), whose sum is σ = 1346890248. Its totient is φ = 191360832.

The previous prime is 621923717. The next prime is 621923741. The reversal of 621923718 is 817329126.

It is a super-2 number, since 2×621923718² = 773578222021887048, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (621923717) 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 11 ways as a sum of consecutive naturals, for example, 305655 + ... + 307682.

It is an arithmetic number, because the mean of its divisors is an integer number (56120427).

Almost surely, 2^621923718 is an apocalyptic number.

621923718 is an abundant number, since it is smaller than the sum of its proper divisors (724966530).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

621923718 is a wasteful number, since it uses less digits than its factorization.

621923718 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 613368 (or 613355 counting only the distinct ones).

The product of its digits is 36288, while the sum is 39.

The square root of 621923718 is about 24938.3984650178. The cubic root of 621923718 is about 853.5829006707.

The spelling of 621923718 in words is "six hundred twenty-one million, nine hundred twenty-three thousand, seven hundred eighteen".