260721144 has 24 divisors (see below), whose sum is σ = 706119960. Its totient is φ = 86907024.

The previous prime is 260721143. The next prime is 260721161. The reversal of 260721144 is 441127062.

260721144 is a `hidden beast` number, since 2 + 607 + 2 + 11 + 44 = 666.

It is a tau number, because it is divible by the number of its divisors (24).

It is a hoax number, since the sum of its digits (27) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (260721143) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1810492 + ... + 1810635.

It is an arithmetic number, because the mean of its divisors is an integer number (29421665).

Almost surely, 2^260721144 is an apocalyptic number.

260721144 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

260721144 is an abundant number, since it is smaller than the sum of its proper divisors (445398816).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

260721144 is a wasteful number, since it uses less digits than its factorization.

260721144 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3621139 (or 3621132 counting only the distinct ones).

The product of its (nonzero) digits is 2688, while the sum is 27.

The square root of 260721144 is about 16146.8617384308. The cubic root of 260721144 is about 638.8399755045.

The spelling of 260721144 in words is "two hundred sixty million, seven hundred twenty-one thousand, one hundred forty-four".