261440622 has 20 divisors (see below), whose sum is σ = 585821016. Its totient is φ = 87146820.

The previous prime is 261440617. The next prime is 261440629. The reversal of 261440622 is 226044162.

261440622 is a `hidden beast` number, since 2 + 614 + 40 + 6 + 2 + 2 = 666.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261440629) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 806754 + ... + 807077.

Almost surely, 2^261440622 is an apocalyptic number.

261440622 is an abundant number, since it is smaller than the sum of its proper divisors (324380394).

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

261440622 is a wasteful number, since it uses less digits than its factorization.

261440622 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1613845 (or 1613836 counting only the distinct ones).

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

The square root of 261440622 is about 16169.1255793256. The cubic root of 261440622 is about 639.4270767947.

Adding to 261440622 its reverse (226044162), we get a palindrome (487484784).

The spelling of 261440622 in words is "two hundred sixty-one million, four hundred forty thousand, six hundred twenty-two".