28761409 has 8 divisors (see below), whose sum is σ = 29272320. Its totient is φ = 28254576.

The previous prime is 28761407. The next prime is 28761413. The reversal of 28761409 is 90416782.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 28761409 - 2¹ = 28761407 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28761401) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15472 + ... + 17230.

It is an arithmetic number, because the mean of its divisors is an integer number (3659040).

Almost surely, 2^28761409 is an apocalyptic number.

It is an amenable number.

28761409 is a deficient number, since it is larger than the sum of its proper divisors (510911).

28761409 is a wasteful number, since it uses less digits than its factorization.

28761409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2039.

The product of its (nonzero) digits is 24192, while the sum is 37.

The square root of 28761409 is about 5362.9664365909. The cubic root of 28761409 is about 306.3868013559.

The spelling of 28761409 in words is "twenty-eight million, seven hundred sixty-one thousand, four hundred nine".