28744501 has 4 divisors (see below), whose sum is σ = 30435372. Its totient is φ = 27053632.

The previous prime is 28744493. The next prime is 28744543. The reversal of 28744501 is 10544782.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 19448100 + 9296401 = 4410^2 + 3049^2 .

It is a cyclic number.

It is not a de Polignac number, because 28744501 - 2³ = 28744493 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28744571) 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, 845410 + ... + 845443.

It is an arithmetic number, because the mean of its divisors is an integer number (7608843).

Almost surely, 2^28744501 is an apocalyptic number.

It is an amenable number.

28744501 is a deficient number, since it is larger than the sum of its proper divisors (1690871).

28744501 is a wasteful number, since it uses less digits than its factorization.

28744501 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1690870.

The product of its (nonzero) digits is 8960, while the sum is 31.

The square root of 28744501 is about 5361.3898384654. The cubic root of 28744501 is about 306.3267509425.

The spelling of 28744501 in words is "twenty-eight million, seven hundred forty-four thousand, five hundred one".