28423131 has 16 divisors (see below), whose sum is σ = 41437440. Its totient is φ = 17186720.

The previous prime is 28423121. The next prime is 28423139. The reversal of 28423131 is 13132482.

It is a cyclic number.

It is not a de Polignac number, because 28423131 - 2⁹ = 28422619 is a prime.

It is a super-2 number, since 2×28423131² = 1615748751686322, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (28423139) 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, 20890 + ... + 22208.

It is an arithmetic number, because the mean of its divisors is an integer number (2589840).

Almost surely, 2^28423131 is an apocalyptic number.

28423131 is a deficient number, since it is larger than the sum of its proper divisors (13014309).

28423131 is a wasteful number, since it uses less digits than its factorization.

28423131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1986.

The product of its digits is 1152, while the sum is 24.

The square root of 28423131 is about 5331.3348234753. The cubic root of 28423131 is about 305.1808691609.

The spelling of 28423131 in words is "twenty-eight million, four hundred twenty-three thousand, one hundred thirty-one".