28896997 has 4 divisors (see below), whose sum is σ = 28907820. Its totient is φ = 28886176.

The previous prime is 28896983. The next prime is 28897003. The reversal of 28896997 is 79969882.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 26071236 + 2825761 = 5106^2 + 1681^2 .

It is a cyclic number.

It is not a de Polignac number, because 28896997 - 2¹⁹ = 28372709 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 (28896697) 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, 1779 + ... + 7807.

It is an arithmetic number, because the mean of its divisors is an integer number (7226955).

Almost surely, 2^28896997 is an apocalyptic number.

It is an amenable number.

28896997 is a deficient number, since it is larger than the sum of its proper divisors (10823).

28896997 is an equidigital number, since it uses as much as digits as its factorization.

28896997 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10822.

The product of its digits is 3919104, while the sum is 58.

The square root of 28896997 is about 5375.5927115063. The cubic root of 28896997 is about 306.8675064089.

The spelling of 28896997 in words is "twenty-eight million, eight hundred ninety-six thousand, nine hundred ninety-seven".