28453731 has 4 divisors (see below), whose sum is σ = 37938312. Its totient is φ = 18969152.

The previous prime is 28453709. The next prime is 28453741. The reversal of 28453731 is 13735482.

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 28453731 - 2¹⁰ = 28452707 is a prime.

It is a super-2 number, since 2×28453731² = 1619229615640722, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 28453692 and 28453701.

It is not an unprimeable number, because it can be changed into a prime (28453741) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4742286 + ... + 4742291.

It is an arithmetic number, because the mean of its divisors is an integer number (9484578).

Almost surely, 2^28453731 is an apocalyptic number.

28453731 is a deficient number, since it is larger than the sum of its proper divisors (9484581).

28453731 is an equidigital number, since it uses as much as digits as its factorization.

28453731 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9484580.

The product of its digits is 20160, while the sum is 33.

The square root of 28453731 is about 5334.2038768686. The cubic root of 28453731 is about 305.2903478967.

The spelling of 28453731 in words is "twenty-eight million, four hundred fifty-three thousand, seven hundred thirty-one".