261877888 has 32 divisors (see below), whose sum is σ = 539707500. Its totient is φ = 126422016.

The previous prime is 261877873. The next prime is 261877901. The reversal of 261877888 is 888778162.

261877888 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 233233984 + 28643904 = 15272^2 + 5352^2 .

It is a tau number, because it is divible by the number of its divisors (32).

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, 31563 + ... + 38986.

Almost surely, 2^261877888 is an apocalyptic number.

It is an amenable number.

261877888 is an abundant number, since it is smaller than the sum of its proper divisors (277829612).

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

261877888 is an equidigital number, since it uses as much as digits as its factorization.

261877888 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 70592 (or 70580 counting only the distinct ones).

The product of its digits is 2408448, while the sum is 55.

The square root of 261877888 is about 16182.6415643429. The cubic root of 261877888 is about 639.7833641785.

The spelling of 261877888 in words is "two hundred sixty-one million, eight hundred seventy-seven thousand, eight hundred eighty-eight".