261981744 has 40 divisors (see below), whose sum is σ = 698621952. Its totient is φ = 84509760.

The previous prime is 261981739. The next prime is 261981761. The reversal of 261981744 is 447189162.

261981744 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a junction number, because it is equal to n+sod(n) for n = 261981696 and 261981705.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 86544 + ... + 89519.

Almost surely, 2^261981744 is an apocalyptic number.

261981744 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

261981744 is an abundant number, since it is smaller than the sum of its proper divisors (436640208).

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

261981744 is a wasteful number, since it uses less digits than its factorization.

261981744 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 176105 (or 176099 counting only the distinct ones).

The product of its digits is 96768, while the sum is 42.

The square root of 261981744 is about 16185.8501166914. The cubic root of 261981744 is about 639.8679284765.

The spelling of 261981744 in words is "two hundred sixty-one million, nine hundred eighty-one thousand, seven hundred forty-four".