261873276 has 96 divisors (see below), whose sum is σ = 745758720. Its totient is φ = 69854400.

The previous prime is 261873247. The next prime is 261873289. The reversal of 261873276 is 672378162.

It is a super-2 number, since 2×261873276² = 137155225365944352, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 112161 + ... + 114471.

It is an arithmetic number, because the mean of its divisors is an integer number (7768320).

Almost surely, 2^261873276 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 261873276, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (372879360).

261873276 is an abundant number, since it is smaller than the sum of its proper divisors (483885444).

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

261873276 is a wasteful number, since it uses less digits than its factorization.

261873276 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2415 (or 2413 counting only the distinct ones).

The product of its digits is 169344, while the sum is 42.

The square root of 261873276 is about 16182.4990653483. The cubic root of 261873276 is about 639.7796083590.

The spelling of 261873276 in words is "two hundred sixty-one million, eight hundred seventy-three thousand, two hundred seventy-six".