9902701638 has 12 divisors (see below), whose sum is σ = 21455853588. Its totient is φ = 3300900540.

The previous prime is 9902701621. The next prime is 9902701643. The reversal of 9902701638 is 8361072099.

9902701638 is a `hidden beast` number, since 9 + 9 + 0 + 2 + 7 + 0 + 1 + 638 = 666.

It is a junction number, because it is equal to n+sod(n) for n = 9902701593 and 9902701602.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 275075028 + ... + 275075063.

It is an arithmetic number, because the mean of its divisors is an integer number (1787987799).

Almost surely, 2^9902701638 is an apocalyptic number.

9902701638 is an abundant number, since it is smaller than the sum of its proper divisors (11553151950).

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

9902701638 is a wasteful number, since it uses less digits than its factorization.

9902701638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 550150099 (or 550150096 counting only the distinct ones).

The product of its (nonzero) digits is 163296, while the sum is 45.

The square root of 9902701638 is about 99512.3190263396. The cubic root of 9902701638 is about 2147.4244723291.

The spelling of 9902701638 in words is "nine billion, nine hundred two million, seven hundred one thousand, six hundred thirty-eight".