997724836 has 24 divisors (see below), whose sum is σ = 1784716416. Its totient is φ = 487824480.

The previous prime is 997724813. The next prime is 997724837. The reversal of 997724836 is 638427799.

997724836 = T₂₅₇₈₉ + T₂₅₇₉₀ + T₂₅₇₉₁.

It is not an unprimeable number, because it can be changed into a prime (997724837) 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, 425026 + ... + 427366.

It is an arithmetic number, because the mean of its divisors is an integer number (74363184).

Almost surely, 2^997724836 is an apocalyptic number.

997724836 is the 25791-st centered triangular number.

It is an amenable number.

997724836 is a deficient number, since it is larger than the sum of its proper divisors (786991580).

997724836 is a wasteful number, since it uses less digits than its factorization.

997724836 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4659 (or 4657 counting only the distinct ones).

The product of its digits is 4572288, while the sum is 55.

The square root of 997724836 is about 31586.7826155182. The cubic root of 997724836 is about 999.2410361196.

The spelling of 997724836 in words is "nine hundred ninety-seven million, seven hundred twenty-four thousand, eight hundred thirty-six".