978626556 has 192 divisors, whose sum is σ = 2792361600. Its totient is φ = 295206912.

The previous prime is 978626543. The next prime is 978626557. The reversal of 978626556 is 655626879.

It is a happy number.

978626556 is a `hidden beast` number, since 9 + 7 + 8 + 626 + 5 + 5 + 6 = 666.

It is a super-2 number, since 2×978626556² = 1915419872216842272, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (978626557) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 8660356 + ... + 8660468.

It is an arithmetic number, because the mean of its divisors is an integer number (14543550).

Almost surely, 2^978626556 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 978626556, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1396180800).

978626556 is an abundant number, since it is smaller than the sum of its proper divisors (1813735044).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

978626556 is a wasteful number, since it uses less digits than its factorization.

978626556 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 285 (or 277 counting only the distinct ones).

The product of its digits is 5443200, while the sum is 54.

The square root of 978626556 is about 31283.0074641170. The cubic root of 978626556 is about 992.8241489974.

The spelling of 978626556 in words is "nine hundred seventy-eight million, six hundred twenty-six thousand, five hundred fifty-six".