28131411 has 24 divisors (see below), whose sum is σ = 47122432. Its totient is φ = 14612400.

The previous prime is 28131409. The next prime is 28131449. The reversal of 28131411 is 11413182.

It is a happy number.

It is not a de Polignac number, because 28131411 - 2¹ = 28131409 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28131401) 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 23 ways as a sum of consecutive naturals, for example, 2995 + ... + 8076.

Almost surely, 2^28131411 is an apocalyptic number.

28131411 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

28131411 is a deficient number, since it is larger than the sum of its proper divisors (18991021).

28131411 is a wasteful number, since it uses less digits than its factorization.

28131411 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11103 (or 11092 counting only the distinct ones).

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

The square root of 28131411 is about 5303.9052593349. The cubic root of 28131411 is about 304.1332049844.

Adding to 28131411 its reverse (11413182), we get a palindrome (39544593).

It can be divided in two parts, 2813 and 1411, that added together give a palindrome (4224).

The spelling of 28131411 in words is "twenty-eight million, one hundred thirty-one thousand, four hundred eleven".