28049293 has 8 divisors (see below), whose sum is σ = 29801880. Its totient is φ = 26349120.

The previous prime is 28049291. The next prime is 28049299. The reversal of 28049293 is 39294082.

It can be written as a sum of positive squares in 4 ways, for example, as 12659364 + 15389929 = 3558^2 + 3923^2 .

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 28049293 - 2¹ = 28049291 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (37).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28049291) 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, 11998 + ... + 14143.

It is an arithmetic number, because the mean of its divisors is an integer number (3725235).

Almost surely, 2^28049293 is an apocalyptic number.

It is an amenable number.

28049293 is a deficient number, since it is larger than the sum of its proper divisors (1752587).

28049293 is a wasteful number, since it uses less digits than its factorization.

28049293 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26207.

The product of its (nonzero) digits is 31104, while the sum is 37.

The square root of 28049293 is about 5296.1583246727. The cubic root of 28049293 is about 303.8369862698.

The spelling of 28049293 in words is "twenty-eight million, forty-nine thousand, two hundred ninety-three".