261364740 has 96 divisors (see below), whose sum is σ = 900721920. Its totient is φ = 55143936.

The previous prime is 261364739. The next prime is 261364771. The reversal of 261364740 is 47463162.

It is a happy number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 18475 + ... + 29394.

It is an arithmetic number, because the mean of its divisors is an integer number (9382520).

Almost surely, 2^261364740 is an apocalyptic number.

261364740 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

261364740 is an abundant number, since it is smaller than the sum of its proper divisors (639357180).

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

261364740 is a wasteful number, since it uses less digits than its factorization.

261364740 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47901 (or 47899 counting only the distinct ones).

The product of its (nonzero) digits is 24192, while the sum is 33.

The square root of 261364740 is about 16166.7788999541. The cubic root of 261364740 is about 639.3652071687.

It can be divided in two parts, 26136 and 4740, that added together give a triangular number (30876 = T₂₄₈).

The spelling of 261364740 in words is "two hundred sixty-one million, three hundred sixty-four thousand, seven hundred forty".