261245624 has 8 divisors (see below), whose sum is σ = 489835560. Its totient is φ = 130622808.

The previous prime is 261245623. The next prime is 261245629. The reversal of 261245624 is 426542162.

261245624 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (8).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261245623) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16327844 + ... + 16327859.

It is an arithmetic number, because the mean of its divisors is an integer number (61229445).

Almost surely, 2^261245624 is an apocalyptic number.

It is an amenable number.

261245624 is a deficient number, since it is larger than the sum of its proper divisors (228589936).

261245624 is a wasteful number, since it uses less digits than its factorization.

261245624 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32655709 (or 32655705 counting only the distinct ones).

The product of its digits is 23040, while the sum is 32.

The square root of 261245624 is about 16163.0945056941. The cubic root of 261245624 is about 639.2680629777.

Adding to 261245624 its reverse (426542162), we get a palindrome (687787786).

The spelling of 261245624 in words is "two hundred sixty-one million, two hundred forty-five thousand, six hundred twenty-four".