28293405 has 16 divisors (see below), whose sum is σ = 51736704. Its totient is φ = 12934080.

The previous prime is 28293347. The next prime is 28293407. The reversal of 28293405 is 50439282.

It is a happy number.

It is not a de Polignac number, because 28293405 - 2⁶ = 28293341 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28293407) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 134626 + ... + 134835.

It is an arithmetic number, because the mean of its divisors is an integer number (3233544).

Almost surely, 2^28293405 is an apocalyptic number.

It is an amenable number.

28293405 is a deficient number, since it is larger than the sum of its proper divisors (23443299).

28293405 is a wasteful number, since it uses less digits than its factorization.

28293405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 269476.

The product of its (nonzero) digits is 17280, while the sum is 33.

The square root of 28293405 is about 5319.1545380822. The cubic root of 28293405 is about 304.7158690482.

The spelling of 28293405 in words is "twenty-eight million, two hundred ninety-three thousand, four hundred five".