9978479674 has 16 divisors (see below), whose sum is σ = 15737686920. Its totient is φ = 4738224960.

The previous prime is 9978479639. The next prime is 9978479683. The reversal of 9978479674 is 4769748799.

It can be written as a sum of positive squares in 4 ways, for example, as 2295080649 + 7683399025 = 47907^2 + 87655^2 .

It is a super-2 number, since 2×9978479674² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1406649 + ... + 1413724.

Almost surely, 2^9978479674 is an apocalyptic number.

9978479674 is a deficient number, since it is larger than the sum of its proper divisors (5759207246).

9978479674 is a wasteful number, since it uses less digits than its factorization.

9978479674 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2820465.

The product of its digits is 192036096, while the sum is 70.

The square root of 9978479674 is about 99892.3404170710. The cubic root of 9978479674 is about 2152.8881088405. Note that the first 3 decimals are identical.

The spelling of 9978479674 in words is "nine billion, nine hundred seventy-eight million, four hundred seventy-nine thousand, six hundred seventy-four".