261087900 has 72 divisors (see below), whose sum is σ = 757034880. Its totient is φ = 69474240.

The previous prime is 261087889. The next prime is 261087901. The reversal of 261087900 is 9780162.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261087901) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 275227 + ... + 276173.

Almost surely, 2^261087900 is an apocalyptic number.

261087900 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

261087900 is an abundant number, since it is smaller than the sum of its proper divisors (495946980).

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

261087900 is a wasteful number, since it uses less digits than its factorization.

261087900 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1883 (or 1876 counting only the distinct ones).

The product of its (nonzero) digits is 6048, while the sum is 33.

The square root of 261087900 is about 16158.2146290981. The cubic root of 261087900 is about 639.1393868651.

The spelling of 261087900 in words is "two hundred sixty-one million, eighty-seven thousand, nine hundred".