261280964 has 12 divisors (see below), whose sum is σ = 522561984. Its totient is φ = 111977544.

The previous prime is 261280961. The next prime is 261281003. The reversal of 261280964 is 469082162.

261280964 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

261280964 is an admirable number.

It is a hoax number, since the sum of its digits (38) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (261280961) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4665704 + ... + 4665759.

It is an arithmetic number, because the mean of its divisors is an integer number (43546832).

Almost surely, 2^261280964 is an apocalyptic number.

It is an amenable number.

261280964 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

261280964 is a wasteful number, since it uses less digits than its factorization.

261280964 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9331474 (or 9331472 counting only the distinct ones).

The product of its (nonzero) digits is 41472, while the sum is 38.

The square root of 261280964 is about 16164.1876999743. The cubic root of 261280964 is about 639.2968873390.

The spelling of 261280964 in words is "two hundred sixty-one million, two hundred eighty thousand, nine hundred sixty-four".