28522997 has 4 divisors (see below), whose sum is σ = 28533696. Its totient is φ = 28512300.

The previous prime is 28522993. The next prime is 28523081. The reversal of 28522997 is 79922582.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 28522997 - 2² = 28522993 is a prime.

It is a super-2 number, since 2×28522997² = 1627122715724018, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28522993) 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, 2228 + ... + 7874.

It is an arithmetic number, because the mean of its divisors is an integer number (7133424).

Almost surely, 2^28522997 is an apocalyptic number.

It is an amenable number.

28522997 is a deficient number, since it is larger than the sum of its proper divisors (10699).

28522997 is an equidigital number, since it uses as much as digits as its factorization.

28522997 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10698.

The product of its digits is 181440, while the sum is 44.

The square root of 28522997 is about 5340.6925580865. The cubic root of 28522997 is about 305.5378737880.

The spelling of 28522997 in words is "twenty-eight million, five hundred twenty-two thousand, nine hundred ninety-seven".