899987777 has 4 divisors (see below), whose sum is σ = 969217620. Its totient is φ = 830757936.

The previous prime is 899987773. The next prime is 899987783. The reversal of 899987777 is 777789998.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 101586241 + 798401536 = 10079^2 + 28256^2 .

It is a cyclic number.

It is not a de Polignac number, because 899987777 - 2² = 899987773 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 899987777.

It is not an unprimeable number, because it can be changed into a prime (899987771) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 34614902 + ... + 34614927.

It is an arithmetic number, because the mean of its divisors is an integer number (242304405).

Almost surely, 2^899987777 is an apocalyptic number.

It is an amenable number.

899987777 is a deficient number, since it is larger than the sum of its proper divisors (69229843).

899987777 is a wasteful number, since it uses less digits than its factorization.

899987777 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69229842.

The product of its digits is 112021056, while the sum is 71.

The square root of 899987777 is about 29999.7962826417. The cubic root of 899987777 is about 965.4850137796.

The spelling of 899987777 in words is "eight hundred ninety-nine million, nine hundred eighty-seven thousand, seven hundred seventy-seven".