261672144 has 20 divisors (see below), whose sum is σ = 675986496. Its totient is φ = 87224032.

The previous prime is 261672137. The next prime is 261672163. The reversal of 261672144 is 441276162.

261672144 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

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, 2725704 + ... + 2725799.

Almost surely, 2^261672144 is an apocalyptic number.

261672144 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

261672144 is an abundant number, since it is smaller than the sum of its proper divisors (414314352).

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

261672144 is a wasteful number, since it uses less digits than its factorization.

261672144 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5451514 (or 5451508 counting only the distinct ones).

The product of its digits is 16128, while the sum is 33.

The square root of 261672144 is about 16176.2833803071. The cubic root of 261672144 is about 639.6157719766.

The spelling of 261672144 in words is "two hundred sixty-one million, six hundred seventy-two thousand, one hundred forty-four".