28409390 has 8 divisors (see below), whose sum is σ = 51136920. Its totient is φ = 11363752.

The previous prime is 28409371. The next prime is 28409411. The reversal of 28409390 is 9390482.

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 28409390.

It is a congruent number.

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, 1420460 + ... + 1420479.

It is an arithmetic number, because the mean of its divisors is an integer number (6392115).

Almost surely, 2^28409390 is an apocalyptic number.

28409390 is a deficient number, since it is larger than the sum of its proper divisors (22727530).

28409390 is a wasteful number, since it uses less digits than its factorization.

28409390 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2840946.

The product of its (nonzero) digits is 15552, while the sum is 35.

The square root of 28409390 is about 5330.0459660307. The cubic root of 28409390 is about 305.1316819188.

The spelling of 28409390 in words is "twenty-eight million, four hundred nine thousand, three hundred ninety".