28799405 has 8 divisors (see below), whose sum is σ = 35211672. Its totient is φ = 22604608.

The previous prime is 28799401. The next prime is 28799417. The reversal of 28799405 is 50499782.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 11377129 + 17422276 = 3373^2 + 4174^2 .

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 28799405 - 2² = 28799401 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28799401) 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, 54074 + ... + 54603.

It is an arithmetic number, because the mean of its divisors is an integer number (4401459).

Almost surely, 2^28799405 is an apocalyptic number.

It is an amenable number.

28799405 is a deficient number, since it is larger than the sum of its proper divisors (6412267).

28799405 is a wasteful number, since it uses less digits than its factorization.

28799405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 108735.

The product of its (nonzero) digits is 181440, while the sum is 44.

The square root of 28799405 is about 5366.5077098612. The cubic root of 28799405 is about 306.5216620442.

The spelling of 28799405 in words is "twenty-eight million, seven hundred ninety-nine thousand, four hundred five".