8555780978 has 16 divisors (see below), whose sum is σ = 14303783520. Its totient is φ = 3814341696.

The previous prime is 8555780963. The next prime is 8555781023. The reversal of 8555780978 is 8790875558.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 8555780978.

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, 6621476 + ... + 6622767.

It is an arithmetic number, because the mean of its divisors is an integer number (893986470).

Almost surely, 2^8555780978 is an apocalyptic number.

8555780978 is a deficient number, since it is larger than the sum of its proper divisors (5748002542).

8555780978 is a wasteful number, since it uses less digits than its factorization.

8555780978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13244281.

The product of its (nonzero) digits is 28224000, while the sum is 62.

The square root of 8555780978 is about 92497.4647112017. The cubic root of 8555780978 is about 2045.2821093226.

The spelling of 8555780978 in words is "eight billion, five hundred fifty-five million, seven hundred eighty thousand, nine hundred seventy-eight".