28740407 has 8 divisors (see below), whose sum is σ = 30333360. Its totient is φ = 27155520.

The previous prime is 28740403. The next prime is 28740427. The reversal of 28740407 is 70404782.

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 28740407 - 2² = 28740403 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28740401) 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, 6203 + ... + 9795.

It is an arithmetic number, because the mean of its divisors is an integer number (3791670).

Almost surely, 2^28740407 is an apocalyptic number.

28740407 is a deficient number, since it is larger than the sum of its proper divisors (1592953).

28740407 is a wasteful number, since it uses less digits than its factorization.

28740407 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4033.

The product of its (nonzero) digits is 12544, while the sum is 32.

The square root of 28740407 is about 5361.0080208856. The cubic root of 28740407 is about 306.3122071606.

The spelling of 28740407 in words is "twenty-eight million, seven hundred forty thousand, four hundred seven".