634920628889 has 16 divisors (see below), whose sum is σ = 653222722320. Its totient is φ = 616679608320.

The previous prime is 634920628883. The next prime is 634920628907. The reversal of 634920628889 is 988826029436.

It can be written as a sum of positive squares in 8 ways, for example, as 30246427225 + 604674201664 = 173915^2 + 777608^2 .

It is a cyclic number.

It is not a de Polignac number, because 634920628889 - 2²⁸ = 634652193433 is a prime.

It is a super-2 number, since 2×634920628889² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (634920628883) 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, 59150567 + ... + 59161299.

It is an arithmetic number, because the mean of its divisors is an integer number (40826420145).

Almost surely, 2^634920628889 is an apocalyptic number.

It is an amenable number.

634920628889 is a deficient number, since it is larger than the sum of its proper divisors (18302093431).

634920628889 is a wasteful number, since it uses less digits than its factorization.

634920628889 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13420.

The product of its (nonzero) digits is 71663616, while the sum is 65.

The spelling of 634920628889 in words is "six hundred thirty-four billion, nine hundred twenty million, six hundred twenty-eight thousand, eight hundred eighty-nine".