9749117978 has 16 divisors (see below), whose sum is σ = 15229485000. Its totient is φ = 4674879552.

The previous prime is 9749117969. The next prime is 9749118011. The reversal of 9749117978 is 8797119479.

It can be written as a sum of positive squares in 4 ways, for example, as 5514102049 + 4235015929 = 74257^2 + 65077^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 9749117978.

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, 555413 + ... + 572696.

Almost surely, 2^9749117978 is an apocalyptic number.

9749117978 is a deficient number, since it is larger than the sum of its proper divisors (5480367022).

9749117978 is a wasteful number, since it uses less digits than its factorization.

9749117978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1128289.

The product of its digits is 8001504, while the sum is 62.

The square root of 9749117978 is about 98737.6218976333. The cubic root of 9749117978 is about 2136.2649187532.

The spelling of 9749117978 in words is "nine billion, seven hundred forty-nine million, one hundred seventeen thousand, nine hundred seventy-eight".