978531656 has 32 divisors (see below), whose sum is σ = 1868961600. Its totient is φ = 480204480.

The previous prime is 978531649. The next prime is 978531661. The reversal of 978531656 is 656135879.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 126311 + ... + 133833.

It is an arithmetic number, because the mean of its divisors is an integer number (58405050).

Almost surely, 2^978531656 is an apocalyptic number.

It is an amenable number.

978531656 is a deficient number, since it is larger than the sum of its proper divisors (890429944).

978531656 is a wasteful number, since it uses less digits than its factorization.

978531656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7829 (or 7825 counting only the distinct ones).

The product of its digits is 1360800, while the sum is 50.

The square root of 978531656 is about 31281.4906294441. The cubic root of 978531656 is about 992.7920557006.

The spelling of 978531656 in words is "nine hundred seventy-eight million, five hundred thirty-one thousand, six hundred fifty-six".