47728397 has 2 divisors, whose sum is σ = 47728398. Its totient is φ = 47728396.

The previous prime is 47728337. The next prime is 47728441. The reversal of 47728397 is 79382774.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 25694761 + 22033636 = 5069^2 + 4694^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-47728397 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 (47728337) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 23864198 + 23864199.

It is an arithmetic number, because the mean of its divisors is an integer number (23864199).

Almost surely, 2^47728397 is an apocalyptic number.

It is an amenable number.

47728397 is a deficient number, since it is larger than the sum of its proper divisors (1).

47728397 is an equidigital number, since it uses as much as digits as its factorization.

47728397 is an evil number, because the sum of its binary digits is even.

The product of its digits is 592704, while the sum is 47.

The square root of 47728397 is about 6908.5741654845. The cubic root of 47728397 is about 362.7373557684.

The spelling of 47728397 in words is "forty-seven million, seven hundred twenty-eight thousand, three hundred ninety-seven".