28331497 has 2 divisors, whose sum is σ = 28331498. Its totient is φ = 28331496.

The previous prime is 28331491. The next prime is 28331507. The reversal of 28331497 is 79413382.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19927296 + 8404201 = 4464^2 + 2899^2 .

It is a cyclic number.

It is not a de Polignac number, because 28331497 - 2¹⁵ = 28298729 is a prime.

It is a super-2 number, since 2×28331497² = 1605347444522018, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (28331491) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14165748 + 14165749.

It is an arithmetic number, because the mean of its divisors is an integer number (14165749).

Almost surely, 2^28331497 is an apocalyptic number.

It is an amenable number.

28331497 is a deficient number, since it is larger than the sum of its proper divisors (1).

28331497 is an equidigital number, since it uses as much as digits as its factorization.

28331497 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 36288, while the sum is 37.

The square root of 28331497 is about 5322.7339779478. The cubic root of 28331497 is about 304.8525561637.

The spelling of 28331497 in words is "twenty-eight million, three hundred thirty-one thousand, four hundred ninety-seven".