261288328 has 16 divisors (see below), whose sum is σ = 559903680. Its totient is φ = 111980688.

The previous prime is 261288319. The next prime is 261288341. The reversal of 261288328 is 823882162.

261288328 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2332876 + ... + 2332987.

It is an arithmetic number, because the mean of its divisors is an integer number (34993980).

Almost surely, 2^261288328 is an apocalyptic number.

261288328 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

261288328 is an abundant number, since it is smaller than the sum of its proper divisors (298615352).

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

261288328 is a wasteful number, since it uses less digits than its factorization.

261288328 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4665876 (or 4665872 counting only the distinct ones).

The product of its digits is 73728, while the sum is 40.

The square root of 261288328 is about 16164.4154858751. The cubic root of 261288328 is about 639.3028933105.

The spelling of 261288328 in words is "two hundred sixty-one million, two hundred eighty-eight thousand, three hundred twenty-eight".