978639167 has 18 divisors (see below), whose sum is σ = 1124359656. Its totient is φ = 849555520.

The previous prime is 978639163. The next prime is 978639199. The reversal of 978639167 is 761936879.

It is not a de Polignac number, because 978639167 - 2² = 978639163 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (978639161) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 1650023 + ... + 1650615.

Almost surely, 2^978639167 is an apocalyptic number.

978639167 is a deficient number, since it is larger than the sum of its proper divisors (145720489).

978639167 is an equidigital number, since it uses as much as digits as its factorization.

978639167 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1231 (or 627 counting only the distinct ones).

The product of its digits is 3429216, while the sum is 56.

The square root of 978639167 is about 31283.2090265689. The cubic root of 978639167 is about 992.8284136311.

The spelling of 978639167 in words is "nine hundred seventy-eight million, six hundred thirty-nine thousand, one hundred sixty-seven".