997728033 has 8 divisors (see below), whose sum is σ = 1330547200. Its totient is φ = 665030448.

The previous prime is 997728029. The next prime is 997728041. The reversal of 997728033 is 330827799.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 997728033 - 2² = 997728029 is a prime.

It is a super-2 number, since 2×997728033² = 1990922455668098178, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (997728023) 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, 9118 + ... + 45591.

It is an arithmetic number, because the mean of its divisors is an integer number (166318400).

Almost surely, 2^997728033 is an apocalyptic number.

997728033 is the 18237-th octagonal number.

It is an amenable number.

997728033 is a deficient number, since it is larger than the sum of its proper divisors (332819167).

997728033 is a wasteful number, since it uses less digits than its factorization.

997728033 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60791.

The product of its (nonzero) digits is 571536, while the sum is 48.

The square root of 997728033 is about 31586.8332220880. The cubic root of 997728033 is about 999.2421034045.

The spelling of 997728033 in words is "nine hundred ninety-seven million, seven hundred twenty-eight thousand, thirty-three".