28841405 has 8 divisors (see below), whose sum is σ = 34762200. Its totient is φ = 22971456.

The previous prime is 28841387. The next prime is 28841437. The reversal of 28841405 is 50414882.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 17131321 + 11710084 = 4139^2 + 3422^2 .

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28841405 is a prime.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11450 + ... + 13739.

It is an arithmetic number, because the mean of its divisors is an integer number (4345275).

Almost surely, 2^28841405 is an apocalyptic number.

It is an amenable number.

28841405 is a deficient number, since it is larger than the sum of its proper divisors (5920795).

28841405 is a wasteful number, since it uses less digits than its factorization.

28841405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25423.

The product of its (nonzero) digits is 10240, while the sum is 32.

The square root of 28841405 is about 5370.4194435817. The cubic root of 28841405 is about 306.6705963317.

The spelling of 28841405 in words is "twenty-eight million, eight hundred forty-one thousand, four hundred five".