97728187 has 2 divisors, whose sum is σ = 97728188. Its totient is φ = 97728186.

The previous prime is 97728157. The next prime is 97728193. The reversal of 97728187 is 78182779.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-97728187 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 97728187.

It is not a weakly prime, because it can be changed into another prime (97728157) 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 as a sum of consecutive naturals, namely, 48864093 + 48864094.

It is an arithmetic number, because the mean of its divisors is an integer number (48864094).

Almost surely, 2^97728187 is an apocalyptic number.

97728187 is a deficient number, since it is larger than the sum of its proper divisors (1).

97728187 is an equidigital number, since it uses as much as digits as its factorization.

97728187 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 395136, while the sum is 49.

The square root of 97728187 is about 9885.7567742687. The cubic root of 97728187 is about 460.6169839974.

The spelling of 97728187 in words is "ninety-seven million, seven hundred twenty-eight thousand, one hundred eighty-seven".