28738091 has 2 divisors, whose sum is σ = 28738092. Its totient is φ = 28738090.

The previous prime is 28738081. The next prime is 28738097. The reversal of 28738091 is 19083782.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 28738091 - 2²² = 24543787 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (28738097) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14369045 + 14369046.

It is an arithmetic number, because the mean of its divisors is an integer number (14369046).

Almost surely, 2^28738091 is an apocalyptic number.

28738091 is a deficient number, since it is larger than the sum of its proper divisors (1).

28738091 is an equidigital number, since it uses as much as digits as its factorization.

28738091 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 24192, while the sum is 38.

The square root of 28738091 is about 5360.7920123803. The cubic root of 28738091 is about 306.3039790455.

The spelling of 28738091 in words is "twenty-eight million, seven hundred thirty-eight thousand, ninety-one".