978657872 has 20 divisors (see below), whose sum is σ = 1897271796. Its totient is φ = 489039360.

The previous prime is 978657851. The next prime is 978657893. The reversal of 978657872 is 278756879.

It is an interprime number because it is at equal distance from previous prime (978657851) and next prime (978657893).

It can be written as a sum of positive squares in 2 ways, for example, as 781985296 + 196672576 = 27964^2 + 14024^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11222 + ... + 45642.

Almost surely, 2^978657872 is an apocalyptic number.

It is an amenable number.

978657872 is a deficient number, since it is larger than the sum of its proper divisors (918613924).

978657872 is a wasteful number, since it uses less digits than its factorization.

978657872 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36206 (or 36200 counting only the distinct ones).

The product of its digits is 11854080, while the sum is 59.

The square root of 978657872 is about 31283.5079874364. The cubic root of 978657872 is about 992.8347389918.

The spelling of 978657872 in words is "nine hundred seventy-eight million, six hundred fifty-seven thousand, eight hundred seventy-two".