28621011 has 16 divisors (see below), whose sum is σ = 40487040. Its totient is φ = 17933760.

The previous prime is 28621009. The next prime is 28621027. The reversal of 28621011 is 11012682.

It is not a de Polignac number, because 28621011 - 2¹ = 28621009 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28621211) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5551 + ... + 9383.

It is an arithmetic number, because the mean of its divisors is an integer number (2530440).

Almost surely, 2^28621011 is an apocalyptic number.

28621011 is a deficient number, since it is larger than the sum of its proper divisors (11866029).

28621011 is a wasteful number, since it uses less digits than its factorization.

28621011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3986.

The product of its (nonzero) digits is 192, while the sum is 21.

The square root of 28621011 is about 5349.8608393116. The cubic root of 28621011 is about 305.8874484612.

Adding to 28621011 its reverse (11012682), we get a palindrome (39633693).

The spelling of 28621011 in words is "twenty-eight million, six hundred twenty-one thousand, eleven".