28032491 has 2 divisors, whose sum is σ = 28032492. Its totient is φ = 28032490.

The previous prime is 28032481. The next prime is 28032523. The reversal of 28032491 is 19423082.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28032491 is a prime.

It is not a weakly prime, because it can be changed into another prime (28032461) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14016245 + 14016246.

It is an arithmetic number, because the mean of its divisors is an integer number (14016246).

Almost surely, 2^28032491 is an apocalyptic number.

28032491 is a deficient number, since it is larger than the sum of its proper divisors (1).

28032491 is an equidigital number, since it uses as much as digits as its factorization.

28032491 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3456, while the sum is 29.

The square root of 28032491 is about 5294.5718429350. The cubic root of 28032491 is about 303.7763063241.

The spelling of 28032491 in words is "twenty-eight million, thirty-two thousand, four hundred ninety-one".