261263776 has 24 divisors (see below), whose sum is σ = 515198880. Its totient is φ = 130419648.

The previous prime is 261263731. The next prime is 261263791. The reversal of 261263776 is 677362162.

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, 14395 + ... + 27013.

It is an arithmetic number, because the mean of its divisors is an integer number (21466620).

Almost surely, 2^261263776 is an apocalyptic number.

It is an amenable number.

261263776 is a deficient number, since it is larger than the sum of its proper divisors (253935104).

261263776 is a wasteful number, since it uses less digits than its factorization.

261263776 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13276 (or 13268 counting only the distinct ones).

The product of its digits is 127008, while the sum is 40.

The square root of 261263776 is about 16163.6560220762. The cubic root of 261263776 is about 639.2828686167.

The spelling of 261263776 in words is "two hundred sixty-one million, two hundred sixty-three thousand, seven hundred seventy-six".