28491037 has 2 divisors, whose sum is σ = 28491038. Its totient is φ = 28491036.

The previous prime is 28491019. The next prime is 28491049. The reversal of 28491037 is 73019482.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19882681 + 8608356 = 4459^2 + 2934^2 .

It is a cyclic number.

It is not a de Polignac number, because 28491037 - 2⁷ = 28490909 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 28490993 and 28491011.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28491017) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14245518 + 14245519.

It is an arithmetic number, because the mean of its divisors is an integer number (14245519).

Almost surely, 2^28491037 is an apocalyptic number.

It is an amenable number.

28491037 is a deficient number, since it is larger than the sum of its proper divisors (1).

28491037 is an equidigital number, since it uses as much as digits as its factorization.

28491037 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 12096, while the sum is 34.

The square root of 28491037 is about 5337.6995981415. The cubic root of 28491037 is about 305.4237128071.

The spelling of 28491037 in words is "twenty-eight million, four hundred ninety-one thousand, thirty-seven".