28390738 has 8 divisors (see below), whose sum is σ = 42984432. Its totient is φ = 14062596.

The previous prime is 28390727. The next prime is 28390759. The reversal of 28390738 is 83709382.

It is a happy number.

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

It is a self number, because there is not a number n which added to its sum of digits gives 28390738.

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, 66120 + ... + 66547.

It is an arithmetic number, because the mean of its divisors is an integer number (5373054).

Almost surely, 2^28390738 is an apocalyptic number.

28390738 is a deficient number, since it is larger than the sum of its proper divisors (14593694).

28390738 is a wasteful number, since it uses less digits than its factorization.

28390738 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 132776.

The product of its (nonzero) digits is 72576, while the sum is 40.

The square root of 28390738 is about 5328.2959752626. The cubic root of 28390738 is about 305.0648898932.

The spelling of 28390738 in words is "twenty-eight million, three hundred ninety thousand, seven hundred thirty-eight".