28943506 has 4 divisors (see below), whose sum is σ = 43415262. Its totient is φ = 14471752.

The previous prime is 28943501. The next prime is 28943513. The reversal of 28943506 is 60534982.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 60534982 = 2 ⋅30267491.

It can be written as a sum of positive squares in only one way, i.e., 21242881 + 7700625 = 4609^2 + 2775^2 .

It is not an unprimeable number, because it can be changed into a prime (28943501) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7235875 + ... + 7235878.

Almost surely, 2^28943506 is an apocalyptic number.

28943506 is a deficient number, since it is larger than the sum of its proper divisors (14471756).

28943506 is a wasteful number, since it uses less digits than its factorization.

28943506 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14471755.

The product of its (nonzero) digits is 51840, while the sum is 37.

The square root of 28943506 is about 5379.9169138566. The cubic root of 28943506 is about 307.0320500444.

It can be divided in two parts, 2894 and 3506, that added together give a square (6400 = 80²).

The spelling of 28943506 in words is "twenty-eight million, nine hundred forty-three thousand, five hundred six".