978772655 has 16 divisors (see below), whose sum is σ = 1378597440. Its totient is φ = 653018112.

The previous prime is 978772643. The next prime is 978772693. The reversal of 978772655 is 556277879.

It is a cyclic number.

It is not a de Polignac number, because 978772655 - 2¹⁴ = 978756271 is a prime.

It is a Smith number, since the sum of its digits (56) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a self number, because there is not a number n which added to its sum of digits gives 978772655.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 376610 + ... + 379199.

It is an arithmetic number, because the mean of its divisors is an integer number (86162340).

Almost surely, 2^978772655 is an apocalyptic number.

978772655 is a deficient number, since it is larger than the sum of its proper divisors (399824785).

978772655 is a wasteful number, since it uses less digits than its factorization.

978772655 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 755858.

The product of its digits is 7408800, while the sum is 56.

The square root of 978772655 is about 31285.3424945293. The cubic root of 978772655 is about 992.8735527244.

The spelling of 978772655 in words is "nine hundred seventy-eight million, seven hundred seventy-two thousand, six hundred fifty-five".