997777773 has 12 divisors (see below), whose sum is σ = 1441587420. Its totient is φ = 665022336.

The previous prime is 997777771. The next prime is 997777783. The reversal of 997777773 is 377777799.

It can be written as a sum of positive squares in 2 ways, for example, as 477116649 + 520661124 = 21843^2 + 22818^2 .

It is not a de Polignac number, because 997777773 - 2¹ = 997777771 is a prime.

It is a Curzon number.

It is a nialpdrome in base 10.

It is a self number, because there is not a number n which added to its sum of digits gives 997777773.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (997777771) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 34015 + ... + 56147.

It is an arithmetic number, because the mean of its divisors is an integer number (120132285).

Almost surely, 2^997777773 is an apocalyptic number.

It is an amenable number.

997777773 is a deficient number, since it is larger than the sum of its proper divisors (443809647).

997777773 is a wasteful number, since it uses less digits than its factorization.

997777773 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27148 (or 27145 counting only the distinct ones).

The product of its digits is 28588707, while the sum is 63.

The square root of 997777773 is about 31587.6205656583. The cubic root of 997777773 is about 999.2587082890.

The spelling of 997777773 in words is "nine hundred ninety-seven million, seven hundred seventy-seven thousand, seven hundred seventy-three".