28440723 has 6 divisors (see below), whose sum is σ = 37933284. Its totient is φ = 18954324.

The previous prime is 28440721. The next prime is 28440743. The reversal of 28440723 is 32704482.

It is not a de Polignac number, because 28440723 - 2¹ = 28440721 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28440721) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 7698 + ... + 10776.

It is an arithmetic number, because the mean of its divisors is an integer number (6322214).

Almost surely, 2^28440723 is an apocalyptic number.

28440723 is a deficient number, since it is larger than the sum of its proper divisors (9492561).

28440723 is an frugal number, since it uses more digits than its factorization.

28440723 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6161 (or 3082 counting only the distinct ones).

The product of its (nonzero) digits is 10752, while the sum is 30.

The square root of 28440723 is about 5332.9844365046. The cubic root of 28440723 is about 305.2438182968.

The spelling of 28440723 in words is "twenty-eight million, four hundred forty thousand, seven hundred twenty-three".