978949287 has 8 divisors (see below), whose sum is σ = 1450295280. Its totient is φ = 652632840.

The previous prime is 978949243. The next prime is 978949291. The reversal of 978949287 is 782949879.

It is not a de Polignac number, because 978949287 - 2¹¹ = 978947239 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (978949487) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18128664 + ... + 18128717.

It is an arithmetic number, because the mean of its divisors is an integer number (181286910).

Almost surely, 2^978949287 is an apocalyptic number.

978949287 is a deficient number, since it is larger than the sum of its proper divisors (471345993).

978949287 is a wasteful number, since it uses less digits than its factorization.

978949287 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36257390 (or 36257384 counting only the distinct ones).

The product of its digits is 18289152, while the sum is 63.

The square root of 978949287 is about 31288.1652865744. The cubic root of 978949287 is about 992.9332746943.

The spelling of 978949287 in words is "nine hundred seventy-eight million, nine hundred forty-nine thousand, two hundred eighty-seven".