28390386 has 16 divisors (see below), whose sum is σ = 56939904. Its totient is φ = 9436944.

The previous prime is 28390361. The next prime is 28390403. The reversal of 28390386 is 68309382.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4245 + ... + 8648.

It is an arithmetic number, because the mean of its divisors is an integer number (3558744).

Almost surely, 2^28390386 is an apocalyptic number.

28390386 is an abundant number, since it is smaller than the sum of its proper divisors (28549518).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

28390386 is a wasteful number, since it uses less digits than its factorization.

28390386 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13265.

The product of its (nonzero) digits is 62208, while the sum is 39.

The square root of 28390386 is about 5328.2629439621. The cubic root of 28390386 is about 305.0636291148.

The spelling of 28390386 in words is "twenty-eight million, three hundred ninety thousand, three hundred eighty-six".