978952257 has 16 divisors (see below), whose sum is σ = 1526632000. Its totient is φ = 618285312.

The previous prime is 978952171. The next prime is 978952283. The reversal of 978952257 is 752259879.

It is not a de Polignac number, because 978952257 - 2⁷ = 978952129 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (978953257) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 953632 + ... + 954657.

It is an arithmetic number, because the mean of its divisors is an integer number (95414500).

Almost surely, 2^978952257 is an apocalyptic number.

It is an amenable number.

978952257 is a deficient number, since it is larger than the sum of its proper divisors (547679743).

978952257 is a wasteful number, since it uses less digits than its factorization.

978952257 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1908317 (or 1908311 counting only the distinct ones).

The product of its digits is 3175200, while the sum is 54.

The square root of 978952257 is about 31288.2127485735. The cubic root of 978952257 is about 992.9342788351.

The spelling of 978952257 in words is "nine hundred seventy-eight million, nine hundred fifty-two thousand, two hundred fifty-seven".