28669997 has 4 divisors (see below), whose sum is σ = 28734300. Its totient is φ = 28605696.

The previous prime is 28669967. The next prime is 28670003. The reversal of 28669997 is 79996682.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 79996682 = 2 ⋅39998341.

It can be written as a sum of positive squares in 2 ways, for example, as 8185321 + 20484676 = 2861^2 + 4526^2 .

It is a cyclic number.

It is not a de Polignac number, because 28669997 - 2¹⁰ = 28668973 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 (28669967) 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, 31478 + ... + 32375.

It is an arithmetic number, because the mean of its divisors is an integer number (7183575).

Almost surely, 2^28669997 is an apocalyptic number.

It is an amenable number.

28669997 is a deficient number, since it is larger than the sum of its proper divisors (64303).

28669997 is an equidigital number, since it uses as much as digits as its factorization.

28669997 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64302.

The product of its digits is 2939328, while the sum is 56.

The square root of 28669997 is about 5354.4371319495. The cubic root of 28669997 is about 306.0618618433.

The spelling of 28669997 in words is "twenty-eight million, six hundred sixty-nine thousand, nine hundred ninety-seven".