9897928761 has 16 divisors (see below), whose sum is σ = 15876377600. Its totient is φ = 5358277008.

The previous prime is 9897928759. The next prime is 9897928801. The reversal of 9897928761 is 1678297989.

It is not a de Polignac number, because 9897928761 - 2¹ = 9897928759 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 9897928692 and 9897928701.

It is not an unprimeable number, because it can be changed into a prime (9897928741) 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, 12403021 + ... + 12403818.

It is an arithmetic number, because the mean of its divisors is an integer number (992273600).

Almost surely, 2^9897928761 is an apocalyptic number.

It is an amenable number.

9897928761 is a deficient number, since it is larger than the sum of its proper divisors (5978448839).

9897928761 is a wasteful number, since it uses less digits than its factorization.

9897928761 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24806868.

The product of its digits is 27433728, while the sum is 66.

The square root of 9897928761 is about 99488.3347986084. The cubic root of 9897928761 is about 2147.0794136321.

The spelling of 9897928761 in words is "nine billion, eight hundred ninety-seven million, nine hundred twenty-eight thousand, seven hundred sixty-one".