261464140 has 24 divisors (see below), whose sum is σ = 627514272. Its totient is φ = 89644800.

The previous prime is 261464129. The next prime is 261464213. The reversal of 261464140 is 41464162.

It is a Harshad number since it is a multiple of its sum of digits (28).

It is a junction number, because it is equal to n+sod(n) for n = 261464099 and 261464108.

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 7 ways as a sum of consecutive naturals, for example, 933661 + ... + 933940.

It is an arithmetic number, because the mean of its divisors is an integer number (26146428).

Almost surely, 2^261464140 is an apocalyptic number.

261464140 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

261464140 is an abundant number, since it is smaller than the sum of its proper divisors (366050132).

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

261464140 is a wasteful number, since it uses less digits than its factorization.

261464140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1867617 (or 1867615 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 28.

The square root of 261464140 is about 16169.8528131829. The cubic root of 261464140 is about 639.4462495295.

The spelling of 261464140 in words is "two hundred sixty-one million, four hundred sixty-four thousand, one hundred forty".