261203824 has 40 divisors (see below), whose sum is σ = 603532800. Its totient is φ = 107076288.

The previous prime is 261203791. The next prime is 261203837. The reversal of 261203824 is 428302162.

It is a Harshad number since it is a multiple of its sum of digits (28).

It is a junction number, because it is equal to n+sod(n) for n = 261203792 and 261203801.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 48124 + ... + 53275.

It is an arithmetic number, because the mean of its divisors is an integer number (15088320).

Almost surely, 2^261203824 is an apocalyptic number.

It is an amenable number.

261203824 is an abundant number, since it is smaller than the sum of its proper divisors (342328976).

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

261203824 is a wasteful number, since it uses less digits than its factorization.

261203824 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 101437 (or 101431 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 28.

The square root of 261203824 is about 16161.8013847467. The cubic root of 261203824 is about 639.2339662914.

Adding to 261203824 its reverse (428302162), we get a palindrome (689505986).

The spelling of 261203824 in words is "two hundred sixty-one million, two hundred three thousand, eight hundred twenty-four".