9978271758 has 48 divisors (see below), whose sum is σ = 26608729056. Its totient is φ = 2631631680.

The previous prime is 9978271739. The next prime is 9978271759. The reversal of 9978271758 is 8571728799.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a junction number, because it is equal to n+sod(n) for n = 9978271695 and 9978271704.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9978271759) 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, 3044233 + ... + 3047508.

It is an arithmetic number, because the mean of its divisors is an integer number (554348522).

Almost surely, 2^9978271758 is an apocalyptic number.

9978271758 is an abundant number, since it is smaller than the sum of its proper divisors (16630457298).

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

9978271758 is a wasteful number, since it uses less digits than its factorization.

9978271758 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6091769 (or 6091766 counting only the distinct ones).

The product of its digits is 17781120, while the sum is 63.

The square root of 9978271758 is about 99891.2997112361. The cubic root of 9978271758 is about 2152.8731558949.

The spelling of 9978271758 in words is "nine billion, nine hundred seventy-eight million, two hundred seventy-one thousand, seven hundred fifty-eight".