261523704 has 64 divisors (see below), whose sum is σ = 712656000. Its totient is φ = 79491456.

The previous prime is 261523693. The next prime is 261523709. The reversal of 261523704 is 407325162.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261523709) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 20847 + ... + 30945.

It is an arithmetic number, because the mean of its divisors is an integer number (11135250).

Almost surely, 2^261523704 is an apocalyptic number.

261523704 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 261523704, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (356328000).

261523704 is an abundant number, since it is smaller than the sum of its proper divisors (451132296).

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

261523704 is a wasteful number, since it uses less digits than its factorization.

261523704 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10204 (or 10200 counting only the distinct ones).

The product of its (nonzero) digits is 10080, while the sum is 30.

The square root of 261523704 is about 16171.6945308771. The cubic root of 261523704 is about 639.4948031406.

Adding to 261523704 its reverse (407325162), we get a palindrome (668848866).

The spelling of 261523704 in words is "two hundred sixty-one million, five hundred twenty-three thousand, seven hundred four".