621662730 has 64 divisors (see below), whose sum is σ = 1610461440. Its totient is φ = 152672256.

The previous prime is 621662711. The next prime is 621662753. The reversal of 621662730 is 37266126.

It is a junction number, because it is equal to n+sod(n) for n = 621662691 and 621662700.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 194586 + ... + 197754.

It is an arithmetic number, because the mean of its divisors is an integer number (25163460).

Almost surely, 2^621662730 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 621662730, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (805230720).

621662730 is an abundant number, since it is smaller than the sum of its proper divisors (988798710).

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

621662730 is a wasteful number, since it uses less digits than its factorization.

621662730 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3695.

The product of its (nonzero) digits is 18144, while the sum is 33.

The square root of 621662730 is about 24933.1652623569. The cubic root of 621662730 is about 853.4634829902.

The spelling of 621662730 in words is "six hundred twenty-one million, six hundred sixty-two thousand, seven hundred thirty".