28994457 has 8 divisors (see below), whose sum is σ = 38712384. Its totient is φ = 19303088.

The previous prime is 28994453. The next prime is 28994477. The reversal of 28994457 is 75449982.

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 28994457 - 2² = 28994453 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28994453) 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, 3933 + ... + 8570.

It is an arithmetic number, because the mean of its divisors is an integer number (4839048).

Almost surely, 2^28994457 is an apocalyptic number.

It is an amenable number.

28994457 is a deficient number, since it is larger than the sum of its proper divisors (9717927).

28994457 is a wasteful number, since it uses less digits than its factorization.

28994457 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13279.

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

The square root of 28994457 is about 5384.6501279099. The cubic root of 28994457 is about 307.2121067786.

The spelling of 28994457 in words is "twenty-eight million, nine hundred ninety-four thousand, four hundred fifty-seven".