620391144 has 32 divisors (see below), whose sum is σ = 1618413120. Its totient is φ = 197805696.

The previous prime is 620391137. The next prime is 620391169. The reversal of 620391144 is 441193026.

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, 561397 + ... + 562500.

It is an arithmetic number, because the mean of its divisors is an integer number (50575410).

Almost surely, 2^620391144 is an apocalyptic number.

It is an amenable number.

620391144 is an abundant number, since it is smaller than the sum of its proper divisors (998021976).

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

620391144 is a wasteful number, since it uses less digits than its factorization.

620391144 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1123929 (or 1123925 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 30.

The square root of 620391144 is about 24907.6523181130. The cubic root of 620391144 is about 852.8811774234.

The spelling of 620391144 in words is "six hundred twenty million, three hundred ninety-one thousand, one hundred forty-four".