261156300 has 72 divisors (see below), whose sum is σ = 757409856. Its totient is φ = 69476160.

The previous prime is 261156293. The next prime is 261156319. The reversal of 261156300 is 3651162.

It is a super-2 number, since 2×261156300² = 136405226059380000, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 175359 + ... + 176841.

Almost surely, 2^261156300 is an apocalyptic number.

261156300 is a gapful number since it is divisible by the number (20) 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 261156300, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (378704928).

261156300 is an abundant number, since it is smaller than the sum of its proper divisors (496253556).

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

261156300 is a wasteful number, since it uses less digits than its factorization.

261156300 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2087 (or 2080 counting only the distinct ones).

The product of its (nonzero) digits is 1080, while the sum is 24.

The square root of 261156300 is about 16160.3310609653. The cubic root of 261156300 is about 639.1951960606.

The spelling of 261156300 in words is "two hundred sixty-one million, one hundred fifty-six thousand, three hundred".