28390011 has 8 divisors (see below), whose sum is σ = 40765200. Its totient is φ = 17470752.

The previous prime is 28390003. The next prime is 28390091. The reversal of 28390011 is 11009382.

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

It is not a de Polignac number, because 28390011 - 2³ = 28390003 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28390001) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 363936 + ... + 364013.

It is an arithmetic number, because the mean of its divisors is an integer number (5095650).

Almost surely, 2^28390011 is an apocalyptic number.

28390011 is a deficient number, since it is larger than the sum of its proper divisors (12375189).

28390011 is a wasteful number, since it uses less digits than its factorization.

28390011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 727965.

The product of its (nonzero) digits is 432, while the sum is 24.

The square root of 28390011 is about 5328.2277541411. The cubic root of 28390011 is about 305.0622859446.

Adding to 28390011 its reverse (11009382), we get a palindrome (39399393).

The spelling of 28390011 in words is "twenty-eight million, three hundred ninety thousand, eleven".