28307031 has 8 divisors (see below), whose sum is σ = 38306304. Its totient is φ = 18589560.

The previous prime is 28307011. The next prime is 28307033. The reversal of 28307031 is 13070382.

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

It is not a de Polignac number, because 28307031 - 2⁹ = 28306519 is a prime.

It is a super-2 number, since 2×28307031² = 1602576008069922, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 28306992 and 28307010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28307033) 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, 70215 + ... + 70616.

It is an arithmetic number, because the mean of its divisors is an integer number (4788288).

Almost surely, 2^28307031 is an apocalyptic number.

28307031 is a deficient number, since it is larger than the sum of its proper divisors (9999273).

28307031 is a wasteful number, since it uses less digits than its factorization.

28307031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 140901.

The product of its (nonzero) digits is 1008, while the sum is 24.

The square root of 28307031 is about 5320.4352265581. The cubic root of 28307031 is about 304.7647778790.

The spelling of 28307031 in words is "twenty-eight million, three hundred seven thousand, thirty-one".