28740405 has 8 divisors (see below), whose sum is σ = 45984672. Its totient is φ = 15328208.

The previous prime is 28740403. The next prime is 28740427. The reversal of 28740405 is 50404782.

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 28740405 - 2¹ = 28740403 is a prime.

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, 957999 + ... + 958028.

It is an arithmetic number, because the mean of its divisors is an integer number (5748084).

Almost surely, 2^28740405 is an apocalyptic number.

It is an amenable number.

28740405 is a deficient number, since it is larger than the sum of its proper divisors (17244267).

28740405 is a wasteful number, since it uses less digits than its factorization.

28740405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1916035.

The product of its (nonzero) digits is 8960, while the sum is 30.

The square root of 28740405 is about 5361.0078343535. The cubic root of 28740405 is about 306.3122000553.

The spelling of 28740405 in words is "twenty-eight million, seven hundred forty thousand, four hundred five".