28051749 has 24 divisors (see below), whose sum is σ = 45287424. Its totient is φ = 16584000.

The previous prime is 28051747. The next prime is 28051753. The reversal of 28051749 is 94715082.

It is not a de Polignac number, because 28051749 - 2¹ = 28051747 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28051747) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 604 + ... + 7514.

It is an arithmetic number, because the mean of its divisors is an integer number (1886976).

Almost surely, 2^28051749 is an apocalyptic number.

It is an amenable number.

28051749 is a deficient number, since it is larger than the sum of its proper divisors (17235675).

28051749 is a wasteful number, since it uses less digits than its factorization.

28051749 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6969 (or 6966 counting only the distinct ones).

The product of its (nonzero) digits is 20160, while the sum is 36.

The square root of 28051749 is about 5296.3901857775. The cubic root of 28051749 is about 303.8458540139.

It can be divided in two parts, 2805 and 1749, that added together give a palindrome (4554).

The spelling of 28051749 in words is "twenty-eight million, fifty-one thousand, seven hundred forty-nine".