261586270 has 48 divisors (see below), whose sum is σ = 527446080. Its totient is φ = 93304640.

The previous prime is 261586261. The next prime is 261586271. The reversal of 261586270 is 72685162.

It is a happy number.

It is a hoax number, since the sum of its digits (37) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261586271) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 62091 + ... + 66169.

It is an arithmetic number, because the mean of its divisors is an integer number (10988460).

Almost surely, 2^261586270 is an apocalyptic number.

261586270 is an abundant number, since it is smaller than the sum of its proper divisors (265859810).

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

261586270 is a wasteful number, since it uses less digits than its factorization.

261586270 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4161 (or 4150 counting only the distinct ones).

The product of its (nonzero) digits is 40320, while the sum is 37.

The square root of 261586270 is about 16173.6288445111. The cubic root of 261586270 is about 639.5457958944.

The spelling of 261586270 in words is "two hundred sixty-one million, five hundred eighty-six thousand, two hundred seventy".