28645031 has 4 divisors (see below), whose sum is σ = 29130600. Its totient is φ = 28159464.

The previous prime is 28644997. The next prime is 28645033. The reversal of 28645031 is 13054682.

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 28645031 - 2¹⁴ = 28628647 is a prime.

It is a super-2 number, since 2×28645031² = 1641075601981922, 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 = 28644985 and 28645003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28645033) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 242696 + ... + 242813.

It is an arithmetic number, because the mean of its divisors is an integer number (7282650).

Almost surely, 2^28645031 is an apocalyptic number.

28645031 is a deficient number, since it is larger than the sum of its proper divisors (485569).

28645031 is an equidigital number, since it uses as much as digits as its factorization.

28645031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 485568.

The product of its (nonzero) digits is 5760, while the sum is 29.

The square root of 28645031 is about 5352.1052867073. The cubic root of 28645031 is about 305.9729958940.

The spelling of 28645031 in words is "twenty-eight million, six hundred forty-five thousand, thirty-one".