620505992 has 12 divisors (see below), whose sum is σ = 1163580855. Its totient is φ = 310217768.

The previous prime is 620505989. The next prime is 620506031. The reversal of 620505992 is 299505026.

It is a powerful number, because all its prime factors have an exponent greater than 1 and also an Achilles number because it is not a perfect power.

It can be written as a sum of positive squares in only one way, i.e., 310252996 + 310252996 = 17614^2 + 17614^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=17614.

It is a super-2 number, since 2×620505992² = 770055372215808128, which contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 66053 + ... + 74859.

Almost surely, 2^620505992 is an apocalyptic number.

It is an amenable number.

620505992 is a deficient number, since it is larger than the sum of its proper divisors (543074863).

620505992 is an frugal number, since it uses more digits than its factorization.

620505992 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17620 (or 8809 counting only the distinct ones).

The product of its (nonzero) digits is 48600, while the sum is 38.

The square root of 620505992 is about 24909.9576876397. The cubic root of 620505992 is about 852.9338031767.

The spelling of 620505992 in words is "six hundred twenty million, five hundred five thousand, nine hundred ninety-two".