620349639 has 64 divisors (see below), whose sum is σ = 1098101760. Its totient is φ = 302330880.

The previous prime is 620349619. The next prime is 620349641. The reversal of 620349639 is 936943026.

It is not a de Polignac number, because 620349639 - 2⁸ = 620349383 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 620349639.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (620349619) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 211209 + ... + 214125.

It is an arithmetic number, because the mean of its divisors is an integer number (17157840).

Almost surely, 2^620349639 is an apocalyptic number.

620349639 is a deficient number, since it is larger than the sum of its proper divisors (477752121).

620349639 is a wasteful number, since it uses less digits than its factorization.

With its predecessor (620349638) it forms an eRAP, since the sums of their prime factors are consecutive (2999 and 3000).

620349639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3000.

The product of its (nonzero) digits is 209952, while the sum is 42.

The square root of 620349639 is about 24906.8191264963. The cubic root of 620349639 is about 852.8621573675.

The spelling of 620349639 in words is "six hundred twenty million, three hundred forty-nine thousand, six hundred thirty-nine".