261556074 has 96 divisors (see below), whose sum is σ = 643083840. Its totient is φ = 78322464.

The previous prime is 261556039. The next prime is 261556091. The reversal of 261556074 is 470655162.

It is a happy number.

261556074 is a `hidden beast` number, since 26 + 1 + 5 + 560 + 74 = 666.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 3151237 + ... + 3151319.

It is an arithmetic number, because the mean of its divisors is an integer number (6698790).

Almost surely, 2^261556074 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 261556074, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (321541920).

261556074 is an abundant number, since it is smaller than the sum of its proper divisors (381527766).

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

261556074 is a wasteful number, since it uses less digits than its factorization.

261556074 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 241 (or 168 counting only the distinct ones).

The product of its (nonzero) digits is 50400, while the sum is 36.

The square root of 261556074 is about 16172.6953226727. The cubic root of 261556074 is about 639.5211864632.

The spelling of 261556074 in words is "two hundred sixty-one million, five hundred fifty-six thousand, seventy-four".