28631081 has 16 divisors (see below), whose sum is σ = 31281600. Its totient is φ = 26111808.

The previous prime is 28631069. The next prime is 28631093. The reversal of 28631081 is 18013682.

It is an interprime number because it is at equal distance from previous prime (28631069) and next prime (28631093).

It is a cyclic number.

It is not a de Polignac number, because 28631081 - 2⁶ = 28631017 is a prime.

It is a super-2 number, since 2×28631081² = 1639477598457122, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (28631881) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 97571 + ... + 97863.

It is an arithmetic number, because the mean of its divisors is an integer number (1955100).

Almost surely, 2^28631081 is an apocalyptic number.

It is an amenable number.

28631081 is a deficient number, since it is larger than the sum of its proper divisors (2650519).

28631081 is a wasteful number, since it uses less digits than its factorization.

28631081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 488.

The product of its (nonzero) digits is 2304, while the sum is 29.

The square root of 28631081 is about 5350.8019025189. The cubic root of 28631081 is about 305.9233186758.

It can be divided in two parts, 2863 and 1081, that multiplied together give a palindrome (3094903).

The spelling of 28631081 in words is "twenty-eight million, six hundred thirty-one thousand, eighty-one".