261037056 has 176 divisors, whose sum is σ = 812249600. Its totient is φ = 72990720.

The previous prime is 261037043. The next prime is 261037069. The reversal of 261037056 is 650730162.

It is an interprime number because it is at equal distance from previous prime (261037043) and next prime (261037069).

It is a zygodrome in base 2.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1311645 + ... + 1311843.

Almost surely, 2^261037056 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 261037056, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (406124800).

261037056 is an abundant number, since it is smaller than the sum of its proper divisors (551212544).

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

261037056 is a wasteful number, since it uses less digits than its factorization.

261037056 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 290 (or 272 counting only the distinct ones).

The product of its (nonzero) digits is 7560, while the sum is 30.

The square root of 261037056 is about 16156.6412351082. The cubic root of 261037056 is about 639.0978957139.

The spelling of 261037056 in words is "two hundred sixty-one million, thirty-seven thousand, fifty-six".