249728641 has 8 divisors (see below), whose sum is σ = 260901504. Its totient is φ = 238582080.

The previous prime is 249728597. The next prime is 249728659. The reversal of 249728641 is 146827942.

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

It is a cyclic number.

It is not a de Polignac number, because 249728641 - 2¹¹ = 249726593 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (249728681) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14281 + ... + 26521.

It is an arithmetic number, because the mean of its divisors is an integer number (32612688).

Almost surely, 2^249728641 is an apocalyptic number.

It is an amenable number.

249728641 is a deficient number, since it is larger than the sum of its proper divisors (11172863).

249728641 is a wasteful number, since it uses less digits than its factorization.

249728641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13151.

The product of its digits is 193536, while the sum is 43.

The square root of 249728641 is about 15802.8048459759. The cubic root of 249728641 is about 629.7325151534.

The spelling of 249728641 in words is "two hundred forty-nine million, seven hundred twenty-eight thousand, six hundred forty-one".