261081792 has 70 divisors (see below), whose sum is σ = 773943588. Its totient is φ = 87025536.

The previous prime is 261081773. The next prime is 261081797. The reversal of 261081792 is 297180162.

It is a super-2 number, since 2×261081792² = 136327404227862528, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (261081797) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 19998 + ... + 30365.

Almost surely, 2^261081792 is an apocalyptic number.

It is an amenable number.

261081792 is an abundant number, since it is smaller than the sum of its proper divisors (512861796).

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

261081792 is an equidigital number, since it uses as much as digits as its factorization.

261081792 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50387 (or 50368 counting only the distinct ones).

The product of its (nonzero) digits is 12096, while the sum is 36.

The square root of 261081792 is about 16158.0256219626. The cubic root of 261081792 is about 639.1344027278.

The spelling of 261081792 in words is "two hundred sixty-one million, eighty-one thousand, seven hundred ninety-two".