28631011 has 4 divisors (see below), whose sum is σ = 29554624. Its totient is φ = 27707400.

The previous prime is 28631003. The next prime is 28631017. The reversal of 28631011 is 11013682.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 28631011 - 2³ = 28631003 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28631017) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 461760 + ... + 461821.

It is an arithmetic number, because the mean of its divisors is an integer number (7388656).

Almost surely, 2^28631011 is an apocalyptic number.

28631011 is a deficient number, since it is larger than the sum of its proper divisors (923613).

28631011 is an equidigital number, since it uses as much as digits as its factorization.

28631011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 923612.

The product of its (nonzero) digits is 288, while the sum is 22.

The square root of 28631011 is about 5350.7953614393. The cubic root of 28631011 is about 305.9230693588.

Adding to 28631011 its reverse (11013682), we get a palindrome (39644693).

The spelling of 28631011 in words is "twenty-eight million, six hundred thirty-one thousand, eleven".