261094320 has 80 divisors (see below), whose sum is σ = 899332320. Its totient is φ = 69624576.

The previous prime is 261094303. The next prime is 261094331. The reversal of 261094320 is 23490162.

261094320 is a `hidden beast` number, since 2 + 610 + 9 + 43 + 2 + 0 = 666.

It is a tau number, because it is divible by the number of its divisors (80).

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 58279 + ... + 62598.

It is an arithmetic number, because the mean of its divisors is an integer number (11241654).

Almost surely, 2^261094320 is an apocalyptic number.

261094320 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

261094320 is an abundant number, since it is smaller than the sum of its proper divisors (638238000).

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

261094320 is a wasteful number, since it uses less digits than its factorization.

261094320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 120899 (or 120887 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 27.

The square root of 261094320 is about 16158.4132884389. The cubic root of 261094320 is about 639.1446255111.

The spelling of 261094320 in words is "two hundred sixty-one million, ninety-four thousand, three hundred twenty".