28487743 has 16 divisors (see below), whose sum is σ = 30451680. Its totient is φ = 26611200.

The previous prime is 28487741. The next prime is 28487803. The reversal of 28487743 is 34778482.

It is a cyclic number.

It is not a de Polignac number, because 28487743 - 2¹ = 28487741 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 28487743.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28487741) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 134908 + ... + 135118.

It is an arithmetic number, because the mean of its divisors is an integer number (1903230).

Almost surely, 2^28487743 is an apocalyptic number.

28487743 is a deficient number, since it is larger than the sum of its proper divisors (1963937).

28487743 is a wasteful number, since it uses less digits than its factorization.

28487743 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 378.

The product of its digits is 301056, while the sum is 43.

The square root of 28487743 is about 5337.3910293326. The cubic root of 28487743 is about 305.4119418013.

The spelling of 28487743 in words is "twenty-eight million, four hundred eighty-seven thousand, seven hundred forty-three".