261101280 has 96 divisors (see below), whose sum is σ = 897257088. Its totient is φ = 63296000.

The previous prime is 261101279. The next prime is 261101299. The reversal of 261101280 is 82101162.

It is a tau number, because it is divible by the number of its divisors (96).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 19446 + ... + 30005.

It is an arithmetic number, because the mean of its divisors is an integer number (9346428).

Almost surely, 2^261101280 is an apocalyptic number.

261101280 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

261101280 is an abundant number, since it is smaller than the sum of its proper divisors (636155808).

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

261101280 is a wasteful number, since it uses less digits than its factorization.

261101280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49480 (or 49472 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 21.

The square root of 261101280 is about 16158.6286546848. The cubic root of 261101280 is about 639.1503046939.

The spelling of 261101280 in words is "two hundred sixty-one million, one hundred one thousand, two hundred eighty".