28451831 has 8 divisors (see below), whose sum is σ = 29925504. Its totient is φ = 27012960.

The previous prime is 28451809. The next prime is 28451833. The reversal of 28451831 is 13815482.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 28451831 - 2¹⁴ = 28435447 is a prime.

It is a super-2 number, since 2×28451831² = 1619013374505122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28451833) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7016 + ... + 10301.

It is an arithmetic number, because the mean of its divisors is an integer number (3740688).

Almost surely, 2^28451831 is an apocalyptic number.

28451831 is a deficient number, since it is larger than the sum of its proper divisors (1473673).

28451831 is a wasteful number, since it uses less digits than its factorization.

28451831 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17401.

The product of its digits is 7680, while the sum is 32.

The square root of 28451831 is about 5334.0257779655. The cubic root of 28451831 is about 305.2835524836.

The spelling of 28451831 in words is "twenty-eight million, four hundred fifty-one thousand, eight hundred thirty-one".