261831072 has 24 divisors (see below), whose sum is σ = 687306816. Its totient is φ = 87276992.

The previous prime is 261831067. The next prime is 261831083. The reversal of 261831072 is 270138162.

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

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, 1363608 + ... + 1363799.

It is an arithmetic number, because the mean of its divisors is an integer number (28637784).

Almost surely, 2^261831072 is an apocalyptic number.

It is an amenable number.

261831072 is an abundant number, since it is smaller than the sum of its proper divisors (425475744).

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

261831072 is a wasteful number, since it uses less digits than its factorization.

261831072 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2727420 (or 2727412 counting only the distinct ones).

The product of its (nonzero) digits is 4032, while the sum is 30.

The square root of 261831072 is about 16181.1950114941. The cubic root of 261831072 is about 639.7452371424.

The spelling of 261831072 in words is "two hundred sixty-one million, eight hundred thirty-one thousand, seventy-two".