2989165978 has 4 divisors (see below), whose sum is σ = 4483748970. Its totient is φ = 1494582988.

The previous prime is 2989165973. The next prime is 2989165999. The reversal of 2989165978 is 8795619892.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 2978648929 + 10517049 = 54577^2 + 3243^2 .

It is a super-2 number, since 2×2989165978² = 17870226488065392968, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (2989165973) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 747291493 + ... + 747291496.

Almost surely, 2^2989165978 is an apocalyptic number.

2989165978 is a deficient number, since it is larger than the sum of its proper divisors (1494582992).

2989165978 is a wasteful number, since it uses less digits than its factorization.

2989165978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1494582991.

The product of its digits is 19595520, while the sum is 64.

The square root of 2989165978 is about 54673.2656606499. The cubic root of 2989165978 is about 1440.5113246511.

The spelling of 2989165978 in words is "two billion, nine hundred eighty-nine million, one hundred sixty-five thousand, nine hundred seventy-eight".