261214644 has 24 divisors (see below), whose sum is σ = 616351680. Its totient is φ = 86092864.

The previous prime is 261214643. The next prime is 261214651. The reversal of 261214644 is 446412162.

It is a happy number.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261214643) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 121224 + ... + 123359.

It is an arithmetic number, because the mean of its divisors is an integer number (25681320).

Almost surely, 2^261214644 is an apocalyptic number.

It is an amenable number.

261214644 is an abundant number, since it is smaller than the sum of its proper divisors (355137036).

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

261214644 is a wasteful number, since it uses less digits than its factorization.

261214644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 244679 (or 244677 counting only the distinct ones).

The product of its digits is 9216, while the sum is 30.

The square root of 261214644 is about 16162.1361211939. The cubic root of 261214644 is about 639.2427926247.

The spelling of 261214644 in words is "two hundred sixty-one million, two hundred fourteen thousand, six hundred forty-four".