28725191 has 8 divisors (see below), whose sum is σ = 31538064. Its totient is φ = 25945920.

The previous prime is 28725181. The next prime is 28725197. The reversal of 28725191 is 19152782.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 28725191 - 2²² = 24530887 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 (28725197) 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, 6590 + ... + 10043.

It is an arithmetic number, because the mean of its divisors is an integer number (3942258).

Almost surely, 2^28725191 is an apocalyptic number.

28725191 is a deficient number, since it is larger than the sum of its proper divisors (2812873).

28725191 is a wasteful number, since it uses less digits than its factorization.

28725191 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16801.

The product of its digits is 10080, while the sum is 35.

The square root of 28725191 is about 5359.5886969058. The cubic root of 28725191 is about 306.2581407804.

The spelling of 28725191 in words is "twenty-eight million, seven hundred twenty-five thousand, one hundred ninety-one".