261285270 has 16 divisors (see below), whose sum is σ = 627084720. Its totient is φ = 69676064.

The previous prime is 261285263. The next prime is 261285293. The reversal of 261285270 is 72582162.

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, 4354725 + ... + 4354784.

It is an arithmetic number, because the mean of its divisors is an integer number (39192795).

Almost surely, 2^261285270 is an apocalyptic number.

261285270 is an abundant number, since it is smaller than the sum of its proper divisors (365799450).

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

261285270 is a wasteful number, since it uses less digits than its factorization.

261285270 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8709519.

The product of its (nonzero) digits is 13440, while the sum is 33.

The square root of 261285270 is about 16164.3208951072. The cubic root of 261285270 is about 639.3003992638.

The spelling of 261285270 in words is "two hundred sixty-one million, two hundred eighty-five thousand, two hundred seventy".