260028721 has 8 divisors (see below), whose sum is σ = 261654624. Its totient is φ = 258408000.

The previous prime is 260028679. The next prime is 260028751. The reversal of 260028721 is 127820062.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-260028721 is a prime.

It is a super-2 number, since 2×260028721² = 135229871489791682, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 260028721.

It is not an unprimeable number, because it can be changed into a prime (260028751) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 147970 + ... + 149716.

It is an arithmetic number, because the mean of its divisors is an integer number (32706828).

Almost surely, 2^260028721 is an apocalyptic number.

It is an amenable number.

260028721 is a deficient number, since it is larger than the sum of its proper divisors (1625903).

260028721 is a wasteful number, since it uses less digits than its factorization.

260028721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2591.

The product of its (nonzero) digits is 2688, while the sum is 28.

The square root of 260028721 is about 16125.4060724064. The cubic root of 260028721 is about 638.2739305471.

Adding to 260028721 its reverse (127820062), we get a palindrome (387848783).

The spelling of 260028721 in words is "two hundred sixty million, twenty-eight thousand, seven hundred twenty-one".