261291080 has 32 divisors (see below), whose sum is σ = 588392640. Its totient is φ = 104429760.

The previous prime is 261291067. The next prime is 261291101. The reversal of 261291080 is 80192162.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 70637 + ... + 74243.

It is an arithmetic number, because the mean of its divisors is an integer number (18387270).

Almost surely, 2^261291080 is an apocalyptic number.

261291080 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

261291080 is an abundant number, since it is smaller than the sum of its proper divisors (327101560).

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

261291080 is a wasteful number, since it uses less digits than its factorization.

261291080 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5429 (or 5425 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 29.

The square root of 261291080 is about 16164.5006109066. The cubic root of 261291080 is about 639.3051377727.

The spelling of 261291080 in words is "two hundred sixty-one million, two hundred ninety-one thousand, eighty".