997592778 has 96 divisors (see below), whose sum is σ = 2667100800. Its totient is φ = 262424448.

The previous prime is 997592773. The next prime is 997592797. The reversal of 997592778 is 877295799.

997592778 is a nontrivial binomial coefficient, being equal to C(44668, 2).

It is a Harshad number since it is a multiple of its sum of digits (63).

It is not an unprimeable number, because it can be changed into a prime (997592773) 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 47 ways as a sum of consecutive naturals, for example, 1160913 + ... + 1161771.

It is an arithmetic number, because the mean of its divisors is an integer number (27782300).

Almost surely, 2^997592778 is an apocalyptic number.

997592778 is the 44667-th triangular number and also the 22334-th hexagonal number.

It is a practical number, because each smaller number is the sum of distinct divisors of 997592778, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1333550400).

997592778 is an abundant number, since it is smaller than the sum of its proper divisors (1669508022).

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

997592778 is a wasteful number, since it uses less digits than its factorization.

997592778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1596 (or 1593 counting only the distinct ones).

The product of its digits is 20003760, while the sum is 63.

The square root of 997592778 is about 31584.6921466713. The cubic root of 997592778 is about 999.1969479467.

The spelling of 997592778 in words is "nine hundred ninety-seven million, five hundred ninety-two thousand, seven hundred seventy-eight".