620640844 has 12 divisors (see below), whose sum is σ = 1111380424. Its totient is φ = 303103584.

The previous prime is 620640799. The next prime is 620640857. The reversal of 620640844 is 448046026.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1804017 + ... + 1804360.

Almost surely, 2^620640844 is an apocalyptic number.

It is an amenable number.

620640844 is a deficient number, since it is larger than the sum of its proper divisors (490739580).

620640844 is a wasteful number, since it uses less digits than its factorization.

620640844 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3608424 (or 3608422 counting only the distinct ones).

The product of its (nonzero) digits is 36864, while the sum is 34.

The square root of 620640844 is about 24912.6643296136. The cubic root of 620640844 is about 852.9955868927.

The spelling of 620640844 in words is "six hundred twenty million, six hundred forty thousand, eight hundred forty-four".