261622662 has 24 divisors (see below), whose sum is σ = 608673816. Its totient is φ = 74749248.

The previous prime is 261622657. The next prime is 261622679. The reversal of 261622662 is 266226162.

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 444643 + ... + 445230.

It is an arithmetic number, because the mean of its divisors is an integer number (25361409).

Almost surely, 2^261622662 is an apocalyptic number.

261622662 is an abundant number, since it is smaller than the sum of its proper divisors (347051154).

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

261622662 is a wasteful number, since it uses less digits than its factorization.

261622662 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 889892 (or 889885 counting only the distinct ones).

The product of its digits is 20736, while the sum is 33.

The square root of 261622662 is about 16174.7538466587. The cubic root of 261622662 is about 639.5754524858.

The spelling of 261622662 in words is "two hundred sixty-one million, six hundred twenty-two thousand, six hundred sixty-two".