620156660 has 24 divisors (see below), whose sum is σ = 1303370376. Its totient is φ = 247864320.

The previous prime is 620156653. The next prime is 620156687. The reversal of 620156660 is 66651026.

It can be written as a sum of positive squares in 4 ways, for example, as 390694756 + 229461904 = 19766^2 + 15148^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14684 + ... + 38156.

It is an arithmetic number, because the mean of its divisors is an integer number (54307099).

Almost surely, 2^620156660 is an apocalyptic number.

It is an amenable number.

620156660 is an abundant number, since it is smaller than the sum of its proper divisors (683213716).

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

620156660 is a wasteful number, since it uses less digits than its factorization.

620156660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24803 (or 24801 counting only the distinct ones).

The product of its (nonzero) digits is 12960, while the sum is 32.

The square root of 620156660 is about 24902.9448057855. The cubic root of 620156660 is about 852.7737117850.

The spelling of 620156660 in words is "six hundred twenty million, one hundred fifty-six thousand, six hundred sixty".