620757225 has 81 divisors (see below), whose sum is σ = 1230257847. Its totient is φ = 298980000.

The previous prime is 620757197. The next prime is 620757233. The reversal of 620757225 is 522757026.

The square root of 620757225 is 24915.

It is a perfect power (a square), and thus also a powerful number.

620757225 is a `hidden beast` number, since 62 + 0 + 7 + 572 + 25 = 666.

It can be written as a sum of positive squares in only one way, i.e., 223472601 + 397284624 = 14949^2 + 19932^2 .

It is a de Polignac number, because none of the positive numbers 2^k-620757225 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 620757225.

It is an unprimeable number.

It is a polite number, since it can be written in 80 ways as a sum of consecutive naturals, for example, 4110900 + ... + 4111050.

Almost surely, 2^620757225 is an apocalyptic number.

620757225 is the 24915-th square number.

620757225 is the 12458-th centered octagonal number.

It is an amenable number.

620757225 is a deficient number, since it is larger than the sum of its proper divisors (609500622).

620757225 is a wasteful number, since it uses less digits than its factorization.

620757225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 340 (or 170 counting only the distinct ones).

The product of its (nonzero) digits is 58800, while the sum is 36.

The cubic root of 620757225 is about 853.0489007515.

Multiplying 620757225 by its sum of digits (36), we get a square (22347260100 = 149490²).

The spelling of 620757225 in words is "six hundred twenty million, seven hundred fifty-seven thousand, two hundred twenty-five".