620720660 has 48 divisors (see below), whose sum is σ = 1577366784. Its totient is φ = 200299008.

The previous prime is 620720647. The next prime is 620720699. The reversal of 620720660 is 66027026.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 128024 + ... + 132783.

It is an arithmetic number, because the mean of its divisors is an integer number (32861808).

Almost surely, 2^620720660 is an apocalyptic number.

It is an amenable number.

620720660 is an abundant number, since it is smaller than the sum of its proper divisors (956646124).

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

620720660 is a wasteful number, since it uses less digits than its factorization.

620720660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 260840 (or 260838 counting only the distinct ones).

The product of its (nonzero) digits is 6048, while the sum is 29.

The square root of 620720660 is about 24914.2661942912. The cubic root of 620720660 is about 853.0321511300.

Adding to 620720660 its reverse (66027026), we get a palindrome (686747686).

The spelling of 620720660 in words is "six hundred twenty million, seven hundred twenty thousand, six hundred sixty".