777561906 has 16 divisors (see below), whose sum is σ = 1696498848. Its totient is φ = 235624800.

The previous prime is 777561899. The next prime is 777561907. The reversal of 777561906 is 609165777.

It is a happy number.

777561906 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (777561907) 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, 5890555 + ... + 5890686.

It is an arithmetic number, because the mean of its divisors is an integer number (106031178).

Almost surely, 2^777561906 is an apocalyptic number.

777561906 is an abundant number, since it is smaller than the sum of its proper divisors (918936942).

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

777561906 is a wasteful number, since it uses less digits than its factorization.

777561906 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11781257.

The product of its (nonzero) digits is 555660, while the sum is 48.

The square root of 777561906 is about 27884.7970406815. The cubic root of 777561906 is about 919.5563022734.

The spelling of 777561906 in words is "seven hundred seventy-seven million, five hundred sixty-one thousand, nine hundred six".