620428990970879 has 16 divisors (see below), whose sum is σ = 685519744916160. Its totient is φ = 558517894725120.

The previous prime is 620428990970809. The next prime is 620428990970903. The reversal of 620428990970879 is 978079099824026.

It is a de Polignac number, because none of the positive numbers 2^k-620428990970879 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (620428990970809) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 30035312 + ... + 46292309.

It is an arithmetic number, because the mean of its divisors is an integer number (42844984057260).

Almost surely, 2^{620428990970879} is an apocalyptic number.

620428990970879 is a deficient number, since it is larger than the sum of its proper divisors (65090753945281).

620428990970879 is a wasteful number, since it uses less digits than its factorization.

620428990970879 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 76348450.

The product of its (nonzero) digits is 1975228416, while the sum is 80.

The spelling of 620428990970879 in words is "six hundred twenty trillion, four hundred twenty-eight billion, nine hundred ninety million, nine hundred seventy thousand, eight hundred seventy-nine".