28925591 has 4 divisors (see below), whose sum is σ = 28950000. Its totient is φ = 28901184.

The previous prime is 28925579. The next prime is 28925597. The reversal of 28925591 is 19552982.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 28925591 - 2¹⁴ = 28909207 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 (28925597) 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, 10331 + ... + 12828.

It is an arithmetic number, because the mean of its divisors is an integer number (7237500).

Almost surely, 2^28925591 is an apocalyptic number.

28925591 is a deficient number, since it is larger than the sum of its proper divisors (24409).

28925591 is a wasteful number, since it uses less digits than its factorization.

28925591 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24408.

The product of its digits is 64800, while the sum is 41.

The square root of 28925591 is about 5378.2516675961. The cubic root of 28925591 is about 306.9686896665.

The spelling of 28925591 in words is "twenty-eight million, nine hundred twenty-five thousand, five hundred ninety-one".