28997403 has 8 divisors (see below), whose sum is σ = 39046416. Its totient is φ = 19140000.

The previous prime is 28997383. The next prime is 28997417. The reversal of 28997403 is 30479982.

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

It is not a de Polignac number, because 28997403 - 2⁸ = 28997147 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28997453) 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, 47548 + ... + 48153.

It is an arithmetic number, because the mean of its divisors is an integer number (4880802).

Almost surely, 2^28997403 is an apocalyptic number.

28997403 is a deficient number, since it is larger than the sum of its proper divisors (10049013).

28997403 is a wasteful number, since it uses less digits than its factorization.

28997403 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 95805.

The product of its (nonzero) digits is 108864, while the sum is 42.

The square root of 28997403 is about 5384.9236763393. The cubic root of 28997403 is about 307.2225112525. Note that the first 3 decimals are identical.

The spelling of 28997403 in words is "twenty-eight million, nine hundred ninety-seven thousand, four hundred three".