261564472 has 32 divisors (see below), whose sum is σ = 528882480. Its totient is φ = 120556800.

The previous prime is 261564467. The next prime is 261564481. The reversal of 261564472 is 274465162.

261564472 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

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, 108108 + ... + 110500.

Almost surely, 2^261564472 is an apocalyptic number.

It is an amenable number.

261564472 is an abundant number, since it is smaller than the sum of its proper divisors (267318008).

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

261564472 is a wasteful number, since it uses less digits than its factorization.

261564472 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3463 (or 3459 counting only the distinct ones).

The product of its digits is 80640, while the sum is 37.

The square root of 261564472 is about 16172.9549557278. The cubic root of 261564472 is about 639.5280309374.

It can be divided in two parts, 26156 and 4472, that added together give a triangular number (30628 = T₂₄₇).

The spelling of 261564472 in words is "two hundred sixty-one million, five hundred sixty-four thousand, four hundred seventy-two".