728791397 has 2 divisors, whose sum is σ = 728791398. Its totient is φ = 728791396.

The previous prime is 728791387. The next prime is 728791403. The reversal of 728791397 is 793197827.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 437269921 + 291521476 = 20911^2 + 17074^2 .

It is an emirp because it is prime and its reverse (793197827) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-728791397 is a prime.

It is a super-2 number, since 2×728791397² = 1062273800682423218, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (728791337) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 364395698 + 364395699.

It is an arithmetic number, because the mean of its divisors is an integer number (364395699).

Almost surely, 2^728791397 is an apocalyptic number.

It is an amenable number.

728791397 is a deficient number, since it is larger than the sum of its proper divisors (1).

728791397 is an equidigital number, since it uses as much as digits as its factorization.

728791397 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1333584, while the sum is 53.

The square root of 728791397 is about 26996.1367050917. The cubic root of 728791397 is about 899.9141469546.

The spelling of 728791397 in words is "seven hundred twenty-eight million, seven hundred ninety-one thousand, three hundred ninety-seven".