97806728 has 16 divisors (see below), whose sum is σ = 185449500. Its totient is φ = 48353536.

The previous prime is 97806727. The next prime is 97806733. The reversal of 97806728 is 82760879.

97806728 is nontrivially palindromic in base 15.

It can be written as a sum of positive squares in 2 ways, for example, as 89151364 + 8655364 = 9442^2 + 2942^2 .

It is not an unprimeable number, because it can be changed into a prime (97806727) 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, 67973 + ... + 69396.

Almost surely, 2^97806728 is an apocalyptic number.

It is an amenable number.

97806728 is a deficient number, since it is larger than the sum of its proper divisors (87642772).

97806728 is a wasteful number, since it uses less digits than its factorization.

97806728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 137464 (or 137460 counting only the distinct ones).

The product of its (nonzero) digits is 338688, while the sum is 47.

The square root of 97806728 is about 9889.7284088088. The cubic root of 97806728 is about 460.7403453069.

The spelling of 97806728 in words is "ninety-seven million, eight hundred six thousand, seven hundred twenty-eight".