28304497 has 8 divisors (see below), whose sum is σ = 30685760. Its totient is φ = 25952400.

The previous prime is 28304489. The next prime is 28304527. The reversal of 28304497 is 79440382.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 28304497 - 2³ = 28304489 is a prime.

It is a super-2 number, since 2×28304497² = 1602289100846018, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28304407) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5247 + ... + 9172.

It is an arithmetic number, because the mean of its divisors is an integer number (3835720).

Almost surely, 2^28304497 is an apocalyptic number.

It is an amenable number.

28304497 is a deficient number, since it is larger than the sum of its proper divisors (2381263).

28304497 is a wasteful number, since it uses less digits than its factorization.

28304497 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14583.

The product of its (nonzero) digits is 48384, while the sum is 37.

The square root of 28304497 is about 5320.1970828156. The cubic root of 28304497 is about 304.7556835896.

The spelling of 28304497 in words is "twenty-eight million, three hundred four thousand, four hundred ninety-seven".