28997445 has 8 divisors (see below), whose sum is σ = 46395936. Its totient is φ = 15465296.

The previous prime is 28997417. The next prime is 28997453. The reversal of 28997445 is 54479982.

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 28997445 - 2⁷ = 28997317 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 28997394 and 28997403.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 966567 + ... + 966596.

It is an arithmetic number, because the mean of its divisors is an integer number (5799492).

Almost surely, 2^28997445 is an apocalyptic number.

It is an amenable number.

28997445 is a deficient number, since it is larger than the sum of its proper divisors (17398491).

28997445 is a wasteful number, since it uses less digits than its factorization.

28997445 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1933171.

The product of its digits is 725760, while the sum is 48.

The square root of 28997445 is about 5384.9275761147. The cubic root of 28997445 is about 307.2226595800. Note that the first 3 decimals are identical.

The spelling of 28997445 in words is "twenty-eight million, nine hundred ninety-seven thousand, four hundred forty-five".