999977766 has 16 divisors (see below), whose sum is σ = 2019373824. Its totient is φ = 330089544.

The previous prime is 999977731. The next prime is 999977767. The reversal of 999977766 is 667779999.

It is a Curzon number.

It is a nialpdrome in base 10.

It is a zygodrome in base 10.

It is a self number, because there is not a number n which added to its sum of digits gives 999977766.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (999977767) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 808426 + ... + 809661.

It is an arithmetic number, because the mean of its divisors is an integer number (126210864).

Almost surely, 2^999977766 is an apocalyptic number.

999977766 is an abundant number, since it is smaller than the sum of its proper divisors (1019396058).

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

999977766 is a wasteful number, since it uses less digits than its factorization.

999977766 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1618195.

The product of its digits is 81015228, while the sum is 69.

The square root of 999977766 is about 31622.4250493222. The cubic root of 999977766 is about 999.9925886117.

The spelling of 999977766 in words is "nine hundred ninety-nine million, nine hundred seventy-seven thousand, seven hundred sixty-six".