28287049 has 4 divisors (see below), whose sum is σ = 32328064. Its totient is φ = 24246036.

The previous prime is 28287013. The next prime is 28287053. The reversal of 28287049 is 94078282.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 94078282 = 2 ⋅47039141.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28287049 is a prime.

It is a super-2 number, since 2×28287049² = 1600314282256802, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28287059) 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, 2020497 + ... + 2020510.

It is an arithmetic number, because the mean of its divisors is an integer number (8082016).

Almost surely, 2^28287049 is an apocalyptic number.

It is an amenable number.

28287049 is a deficient number, since it is larger than the sum of its proper divisors (4041015).

28287049 is an equidigital number, since it uses as much as digits as its factorization.

28287049 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4041014.

The product of its (nonzero) digits is 64512, while the sum is 40.

The square root of 28287049 is about 5318.5570411532. The cubic root of 28287049 is about 304.6930496066.

The spelling of 28287049 in words is "twenty-eight million, two hundred eighty-seven thousand, forty-nine".