261443464 has 8 divisors (see below), whose sum is σ = 490206510. Its totient is φ = 130721728.

The previous prime is 261443453. The next prime is 261443471. The reversal of 261443464 is 464344162.

It can be written as a sum of positive squares in only one way, i.e., 248062500 + 13380964 = 15750^2 + 3658^2 .

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

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16340209 + ... + 16340224.

Almost surely, 2^261443464 is an apocalyptic number.

It is an amenable number.

261443464 is a deficient number, since it is larger than the sum of its proper divisors (228763046).

261443464 is a wasteful number, since it uses less digits than its factorization.

261443464 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32680439 (or 32680435 counting only the distinct ones).

The product of its digits is 55296, while the sum is 34.

The square root of 261443464 is about 16169.2134626271. The cubic root of 261443464 is about 639.4293937582.

The spelling of 261443464 in words is "two hundred sixty-one million, four hundred forty-three thousand, four hundred sixty-four".