261355446 has 48 divisors (see below), whose sum is σ = 618995520. Its totient is φ = 79038960.

The previous prime is 261355441. The next prime is 261355447. The reversal of 261355446 is 644553162.

261355446 is a `hidden beast` number, since 2 + 61 + 3 + 554 + 46 = 666.

It is a self number, because there is not a number n which added to its sum of digits gives 261355446.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261355441) 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, 129481 + ... + 131483.

It is an arithmetic number, because the mean of its divisors is an integer number (12895740).

Almost surely, 2^261355446 is an apocalyptic number.

261355446 is an abundant number, since it is smaller than the sum of its proper divisors (357640074).

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

261355446 is a wasteful number, since it uses less digits than its factorization.

261355446 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2681 (or 2678 counting only the distinct ones).

The product of its digits is 86400, while the sum is 36.

The square root of 261355446 is about 16166.4914560952. The cubic root of 261355446 is about 639.3576285761.

The spelling of 261355446 in words is "two hundred sixty-one million, three hundred fifty-five thousand, four hundred forty-six".