620888639 has 8 divisors (see below), whose sum is σ = 710457888. Its totient is φ = 531537120.

The previous prime is 620888623. The next prime is 620888641. The reversal of 620888639 is 936888026.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 620888639 - 2⁴ = 620888623 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (620888339) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 48272 + ... + 59765.

It is an arithmetic number, because the mean of its divisors is an integer number (88807236).

Almost surely, 2^620888639 is an apocalyptic number.

620888639 is a deficient number, since it is larger than the sum of its proper divisors (89569249).

620888639 is a wasteful number, since it uses less digits than its factorization.

620888639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 108865.

The product of its (nonzero) digits is 995328, while the sum is 50.

The square root of 620888639 is about 24917.6371070774. The cubic root of 620888639 is about 853.1090931820.

The spelling of 620888639 in words is "six hundred twenty million, eight hundred eighty-eight thousand, six hundred thirty-nine".