261164740 has 48 divisors (see below), whose sum is σ = 559907712. Its totient is φ = 102306816.

The previous prime is 261164723. The next prime is 261164753. The reversal of 261164740 is 47461162.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 199167 + ... + 200473.

It is an arithmetic number, because the mean of its divisors is an integer number (11664744).

Almost surely, 2^261164740 is an apocalyptic number.

261164740 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

261164740 is an abundant number, since it is smaller than the sum of its proper divisors (298742972).

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

261164740 is a wasteful number, since it uses less digits than its factorization.

261164740 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1516 (or 1514 counting only the distinct ones).

The product of its (nonzero) digits is 8064, while the sum is 31.

The square root of 261164740 is about 16160.5921921197. The cubic root of 261164740 is about 639.2020817830.

The spelling of 261164740 in words is "two hundred sixty-one million, one hundred sixty-four thousand, seven hundred forty".