620428990970808 has 96 divisors (see below), whose sum is σ = 1690103244960000. Its totient is φ = 205606707742464.

The previous prime is 620428990970801. The next prime is 620428990970809. The reversal of 620428990970808 is 808079099824026.

620428990970808 is a `hidden beast` number, since 6 + 20 + 428 + 9 + 90 + 97 + 0 + 8 + 0 + 8 = 666.

It is a Harshad number since it is a multiple of its sum of digits (72).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (620428990970801) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 344744041 + ... + 346539047.

It is an arithmetic number, because the mean of its divisors is an integer number (17605242135000).

Almost surely, 2^{620428990970808} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 620428990970808, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (845051622480000).

620428990970808 is an abundant number, since it is smaller than the sum of its proper divisors (1069674253989192).

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

620428990970808 is a wasteful number, since it uses less digits than its factorization.

620428990970808 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1822941 (or 1822934 counting only the distinct ones).

The product of its (nonzero) digits is 250822656, while the sum is 72.

The spelling of 620428990970808 in words is "six hundred twenty trillion, four hundred twenty-eight billion, nine hundred ninety million, nine hundred seventy thousand, eight hundred eight".