9879974478 has 24 divisors (see below), whose sum is σ = 23352667416. Its totient is φ = 2993931600.

The previous prime is 9879974459. The next prime is 9879974501. The reversal of 9879974478 is 8744799789.

9879974478 is a `hidden beast` number, since 9 + 87 + 9 + 9 + 74 + 478 = 666.

It is a super-2 number, since 2×9879974478² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 24949233 + ... + 24949628.

It is an arithmetic number, because the mean of its divisors is an integer number (973027809).

Almost surely, 2^9879974478 is an apocalyptic number.

9879974478 is an abundant number, since it is smaller than the sum of its proper divisors (13472692938).

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

9879974478 is a wasteful number, since it uses less digits than its factorization.

9879974478 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49898880 (or 49898877 counting only the distinct ones).

The product of its digits is 256048128, while the sum is 72.

The square root of 9879974478 is about 99398.0607356099. The cubic root of 9879974478 is about 2145.7804009936.

The spelling of 9879974478 in words is "nine billion, eight hundred seventy-nine million, nine hundred seventy-four thousand, four hundred seventy-eight".