28074997 has 4 divisors (see below), whose sum is σ = 28459660. Its totient is φ = 27690336.

The previous prime is 28074983. The next prime is 28075009. The reversal of 28074997 is 79947082.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 79947082 = 2 ⋅39973541.

It can be written as a sum of positive squares in 2 ways, for example, as 4977361 + 23097636 = 2231^2 + 4806^2 .

It is a cyclic number.

It is not a de Polignac number, because 28074997 - 2¹⁵ = 28042229 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28074947) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 192222 + ... + 192367.

It is an arithmetic number, because the mean of its divisors is an integer number (7114915).

Almost surely, 2^28074997 is an apocalyptic number.

It is an amenable number.

28074997 is a deficient number, since it is larger than the sum of its proper divisors (384663).

28074997 is an equidigital number, since it uses as much as digits as its factorization.

28074997 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 384662.

The product of its (nonzero) digits is 254016, while the sum is 46.

The square root of 28074997 is about 5298.5844336011. The cubic root of 28074997 is about 303.9297686618.

The spelling of 28074997 in words is "twenty-eight million, seventy-four thousand, nine hundred ninety-seven".