28390886 has 8 divisors (see below), whose sum is σ = 42609000. Its totient is φ = 14187888.

The previous prime is 28390849. The next prime is 28390891. The reversal of 28390886 is 68809382.

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

It is a Curzon number.

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, 4970 + ... + 9026.

It is an arithmetic number, because the mean of its divisors is an integer number (5326125).

Almost surely, 2^28390886 is an apocalyptic number.

28390886 is a deficient number, since it is larger than the sum of its proper divisors (14218114).

28390886 is a wasteful number, since it uses less digits than its factorization.

28390886 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7558.

The product of its (nonzero) digits is 165888, while the sum is 44.

The square root of 28390886 is about 5328.3098633619. The cubic root of 28390886 is about 305.0654199901.

The spelling of 28390886 in words is "twenty-eight million, three hundred ninety thousand, eight hundred eighty-six".