261245064 has 16 divisors (see below), whose sum is σ = 653112720. Its totient is φ = 87081680.

The previous prime is 261245053. The next prime is 261245087. The reversal of 261245064 is 460542162.

261245064 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5442582 + ... + 5442629.

It is an arithmetic number, because the mean of its divisors is an integer number (40819545).

Almost surely, 2^261245064 is an apocalyptic number.

261245064 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

261245064 is an abundant number, since it is smaller than the sum of its proper divisors (391867656).

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

261245064 is a wasteful number, since it uses less digits than its factorization.

261245064 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10885220 (or 10885216 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 30.

The square root of 261245064 is about 16163.0771822695. The cubic root of 261245064 is about 639.2676062041.

The spelling of 261245064 in words is "two hundred sixty-one million, two hundred forty-five thousand, sixty-four".