261564612 has 24 divisors (see below), whose sum is σ = 610643712. Its totient is φ = 87141600.

The previous prime is 261564607. The next prime is 261564613. The reversal of 261564612 is 216465162.

261564612 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (261564613) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 23437 + ... + 32747.

It is an arithmetic number, because the mean of its divisors is an integer number (25443488).

Almost surely, 2^261564612 is an apocalyptic number.

It is an amenable number.

261564612 is an abundant number, since it is smaller than the sum of its proper divisors (349079100).

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

261564612 is a wasteful number, since it uses less digits than its factorization.

261564612 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11659 (or 11657 counting only the distinct ones).

The product of its digits is 17280, while the sum is 33.

The square root of 261564612 is about 16172.9592839406. The cubic root of 261564612 is about 639.5281450379.

The spelling of 261564612 in words is "two hundred sixty-one million, five hundred sixty-four thousand, six hundred twelve".