28961503 has 4 divisors (see below), whose sum is σ = 28975408. Its totient is φ = 28947600.

The previous prime is 28961501. The next prime is 28961549. The reversal of 28961503 is 30516982.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 30516982 = 2 ⋅15258491.

It is a cyclic number.

It is not a de Polignac number, because 28961503 - 2¹ = 28961501 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28961501) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3126 + ... + 8227.

It is an arithmetic number, because the mean of its divisors is an integer number (7243852).

Almost surely, 2^28961503 is an apocalyptic number.

28961503 is a deficient number, since it is larger than the sum of its proper divisors (13905).

28961503 is a wasteful number, since it uses less digits than its factorization.

28961503 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13904.

The product of its (nonzero) digits is 12960, while the sum is 34.

The square root of 28961503 is about 5381.5892634054. The cubic root of 28961503 is about 307.0956741140.

The spelling of 28961503 in words is "twenty-eight million, nine hundred sixty-one thousand, five hundred three".