28075431 has 16 divisors (see below), whose sum is σ = 38694656. Its totient is φ = 18095616.

The previous prime is 28075427. The next prime is 28075471. The reversal of 28075431 is 13457082.

It is not a de Polignac number, because 28075431 - 2² = 28075427 is a prime.

It is a super-2 number, since 2×28075431² = 1576459651671522, 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 (28075471) 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, 12231 + ... + 14343.

It is an arithmetic number, because the mean of its divisors is an integer number (2418416).

Almost surely, 2^28075431 is an apocalyptic number.

28075431 is a deficient number, since it is larger than the sum of its proper divisors (10619225).

28075431 is a wasteful number, since it uses less digits than its factorization.

28075431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2262.

The product of its (nonzero) digits is 6720, while the sum is 30.

The square root of 28075431 is about 5298.6253877775. The cubic root of 28075431 is about 303.9313347628.

The spelling of 28075431 in words is "twenty-eight million, seventy-five thousand, four hundred thirty-one".