261235064 has 8 divisors (see below), whose sum is σ = 489815760. Its totient is φ = 130617528.

The previous prime is 261235033. The next prime is 261235069. The reversal of 261235064 is 460532162.

It is a tau number, because it is divible by the number of its divisors (8).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261235069) by changing a digit.

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 as a sum of consecutive naturals, namely, 16327184 + ... + 16327199.

It is an arithmetic number, because the mean of its divisors is an integer number (61226970).

Almost surely, 2^261235064 is an apocalyptic number.

It is an amenable number.

261235064 is a deficient number, since it is larger than the sum of its proper divisors (228580696).

261235064 is a wasteful number, since it uses less digits than its factorization.

261235064 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32654389 (or 32654385 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 29.

The square root of 261235064 is about 16162.7678322743. The cubic root of 261235064 is about 639.2594494214.

The spelling of 261235064 in words is "two hundred sixty-one million, two hundred thirty-five thousand, sixty-four".