28400593 has 8 divisors (see below), whose sum is σ = 30672488. Its totient is φ = 26141184.

The previous prime is 28400587. The next prime is 28400621. The reversal of 28400593 is 39500482.

It can be written as a sum of positive squares in 4 ways, for example, as 6385729 + 22014864 = 2527^2 + 4692^2 .

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-28400593 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28400503) 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, 1921 + ... + 7777.

It is an arithmetic number, because the mean of its divisors is an integer number (3834061).

Almost surely, 2^28400593 is an apocalyptic number.

It is an amenable number.

28400593 is a deficient number, since it is larger than the sum of its proper divisors (2271895).

28400593 is a wasteful number, since it uses less digits than its factorization.

28400593 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6243.

The product of its (nonzero) digits is 8640, while the sum is 31.

The square root of 28400593 is about 5329.2206747328. The cubic root of 28400593 is about 305.1001838764.

The spelling of 28400593 in words is "twenty-eight million, four hundred thousand, five hundred ninety-three".