620720775 has 72 divisors (see below), whose sum is σ = 1151354880. Its totient is φ = 319475520.

The previous prime is 620720773. The next prime is 620720783. The reversal of 620720775 is 577027026.

620720775 is a `hidden beast` number, since 620 + 7 + 20 + 7 + 7 + 5 = 666.

It is not a de Polignac number, because 620720775 - 2¹ = 620720773 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (620720773) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 835054 + ... + 835796.

It is an arithmetic number, because the mean of its divisors is an integer number (15991040).

Almost surely, 2^620720775 is an apocalyptic number.

620720775 is a deficient number, since it is larger than the sum of its proper divisors (530634105).

620720775 is a wasteful number, since it uses less digits than its factorization.

620720775 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 885 (or 877 counting only the distinct ones).

The product of its (nonzero) digits is 41160, while the sum is 36.

The square root of 620720775 is about 24914.2685022057. The cubic root of 620720775 is about 853.0322038100.

The spelling of 620720775 in words is "six hundred twenty million, seven hundred twenty thousand, seven hundred seventy-five".