97728157 has 2 divisors, whose sum is σ = 97728158. Its totient is φ = 97728156.

The previous prime is 97728139. The next prime is 97728187. The reversal of 97728157 is 75182779.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 70207641 + 27520516 = 8379^2 + 5246^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-97728157 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (97728187) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 48864078 + 48864079.

It is an arithmetic number, because the mean of its divisors is an integer number (48864079).

Almost surely, 2^97728157 is an apocalyptic number.

It is an amenable number.

97728157 is a deficient number, since it is larger than the sum of its proper divisors (1).

97728157 is an equidigital number, since it uses as much as digits as its factorization.

97728157 is an evil number, because the sum of its binary digits is even.

The product of its digits is 246960, while the sum is 46.

The square root of 97728157 is about 9885.7552569341. The cubic root of 97728157 is about 460.6169368650.

The spelling of 97728157 in words is "ninety-seven million, seven hundred twenty-eight thousand, one hundred fifty-seven".