977678778 has 16 divisors (see below), whose sum is σ = 1956240000. Its totient is φ = 325745856.

The previous prime is 977678773. The next prime is 977678791. The reversal of 977678778 is 877876779.

It is a happy number.

977678778 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (977678773) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21903 + ... + 49346.

It is an arithmetic number, because the mean of its divisors is an integer number (122265000).

Almost surely, 2^977678778 is an apocalyptic number.

977678778 is an abundant number, since it is smaller than the sum of its proper divisors (978561222).

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

977678778 is a wasteful number, since it uses less digits than its factorization.

977678778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 73541.

The product of its digits is 58084992, while the sum is 66.

The square root of 977678778 is about 31267.8553469853. The cubic root of 977678778 is about 992.5035361222.

The spelling of 977678778 in words is "nine hundred seventy-seven million, six hundred seventy-eight thousand, seven hundred seventy-eight".