261542004 has 24 divisors (see below), whose sum is σ = 619375008. Its totient is φ = 85879200.

The previous prime is 261541927. The next prime is 261542027. The reversal of 261542004 is 400245162.

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, 161847 + ... + 163454.

It is an arithmetic number, because the mean of its divisors is an integer number (25807292).

Almost surely, 2^261542004 is an apocalyptic number.

It is an amenable number.

261542004 is an abundant number, since it is smaller than the sum of its proper divisors (357833004).

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

261542004 is a wasteful number, since it uses less digits than its factorization.

261542004 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 325375 (or 325373 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 24.

The square root of 261542004 is about 16172.2603243950. The cubic root of 261542004 is about 639.5097189102.

Adding to 261542004 its reverse (400245162), we get a palindrome (661787166).

The spelling of 261542004 in words is "two hundred sixty-one million, five hundred forty-two thousand, four".