621426740 has 48 divisors (see below), whose sum is σ = 1437778944. Its totient is φ = 223728000.

The previous prime is 621426737. The next prime is 621426781. The reversal of 621426740 is 47624126.

It is a junction number, because it is equal to n+sod(n) for n = 621426697 and 621426706.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8237 + ... + 36203.

It is an arithmetic number, because the mean of its divisors is an integer number (29953728).

Almost surely, 2^621426740 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 621426740, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (718889472).

621426740 is an abundant number, since it is smaller than the sum of its proper divisors (816352204).

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

621426740 is a wasteful number, since it uses less digits than its factorization.

621426740 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28088 (or 28086 counting only the distinct ones).

The product of its (nonzero) digits is 16128, while the sum is 32.

The square root of 621426740 is about 24928.4323614623. The cubic root of 621426740 is about 853.3554746181.

The spelling of 621426740 in words is "six hundred twenty-one million, four hundred twenty-six thousand, seven hundred forty".