261026442 has 64 divisors (see below), whose sum is σ = 595795200. Its totient is φ = 84680640.

The previous prime is 261026429. The next prime is 261026489. The reversal of 261026442 is 244620162.

261026442 is a `hidden beast` number, since 2 + 6 + 10 + 2 + 644 + 2 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 358683 + ... + 359409.

It is an arithmetic number, because the mean of its divisors is an integer number (9309300).

Almost surely, 2^261026442 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 261026442, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (297897600).

261026442 is an abundant number, since it is smaller than the sum of its proper divisors (334768758).

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

261026442 is a wasteful number, since it uses less digits than its factorization.

261026442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 908 (or 902 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 27.

The square root of 261026442 is about 16156.3127600328. The cubic root of 261026442 is about 639.0892334993.

The spelling of 261026442 in words is "two hundred sixty-one million, twenty-six thousand, four hundred forty-two".