28036431 has 18 divisors (see below), whose sum is σ = 41935712. Its totient is φ = 18030960.

The previous prime is 28036429. The next prime is 28036433. The reversal of 28036431 is 13463082.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (28036429) and next prime (28036433).

It is not a de Polignac number, because 28036431 - 2¹ = 28036429 is a prime.

It is a super-2 number, since 2×28036431² = 1572082926435522, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 28036395 and 28036404.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28036433) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 88285 + ... + 88601.

Almost surely, 2^28036431 is an apocalyptic number.

28036431 is a deficient number, since it is larger than the sum of its proper divisors (13899281).

28036431 is an equidigital number, since it uses as much as digits as its factorization.

28036431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 671 (or 351 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 27.

The square root of 28036431 is about 5294.9439090514. The cubic root of 28036431 is about 303.7905376980.

The spelling of 28036431 in words is "twenty-eight million, thirty-six thousand, four hundred thirty-one".