620706660 has 96 divisors (see below), whose sum is σ = 1992453120. Its totient is φ = 141433728.

The previous prime is 620706631. The next prime is 620706673. The reversal of 620706660 is 66607026.

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, 143611 + ... + 147869.

It is an arithmetic number, because the mean of its divisors is an integer number (20754720).

Almost surely, 2^620706660 is an apocalyptic number.

620706660 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 620706660, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (996226560).

620706660 is an abundant number, since it is smaller than the sum of its proper divisors (1371746460).

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

620706660 is a wasteful number, since it uses less digits than its factorization.

620706660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4625 (or 4623 counting only the distinct ones).

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

The square root of 620706660 is about 24913.9852291840. The cubic root of 620706660 is about 853.0257378642.

The spelling of 620706660 in words is "six hundred twenty million, seven hundred six thousand, six hundred sixty".