620921284 has 6 divisors (see below), whose sum is σ = 1086612254. Its totient is φ = 310460640.

The previous prime is 620921263. The next prime is 620921381. The reversal of 620921284 is 482129026.

It can be written as a sum of positive squares in only one way, i.e., 365880384 + 255040900 = 19128^2 + 15970^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 77615157 + ... + 77615164.

Almost surely, 2^620921284 is an apocalyptic number.

It is an amenable number.

620921284 is a deficient number, since it is larger than the sum of its proper divisors (465690970).

620921284 is a wasteful number, since it uses less digits than its factorization.

620921284 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 155230325 (or 155230323 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 34.

The square root of 620921284 is about 24918.2921565664. The cubic root of 620921284 is about 853.1240444720.

The spelling of 620921284 in words is "six hundred twenty million, nine hundred twenty-one thousand, two hundred eighty-four".