28388458 has 8 divisors (see below), whose sum is σ = 48665952. Its totient is φ = 12166476.

The previous prime is 28388449. The next prime is 28388473. The reversal of 28388458 is 85488382.

It is a happy number.

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

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1013860 + ... + 1013887.

It is an arithmetic number, because the mean of its divisors is an integer number (6083244).

Almost surely, 2^28388458 is an apocalyptic number.

28388458 is a deficient number, since it is larger than the sum of its proper divisors (20277494).

28388458 is a wasteful number, since it uses less digits than its factorization.

28388458 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2027756.

The product of its digits is 491520, while the sum is 46.

The square root of 28388458 is about 5328.0820188882. The cubic root of 28388458 is about 305.0567233030.

The spelling of 28388458 in words is "twenty-eight million, three hundred eighty-eight thousand, four hundred fifty-eight".