261580672 has 16 divisors (see below), whose sum is σ = 521118000. Its totient is φ = 130790272.

The previous prime is 261580591. The next prime is 261580703. The reversal of 261580672 is 276085162.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (16).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1021672 + ... + 1021927.

It is an arithmetic number, because the mean of its divisors is an integer number (32569875).

Almost surely, 2^261580672 is an apocalyptic number.

It is an amenable number.

261580672 is a deficient number, since it is larger than the sum of its proper divisors (259537328).

261580672 is an equidigital number, since it uses as much as digits as its factorization.

261580672 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2043613 (or 2043601 counting only the distinct ones).

The product of its (nonzero) digits is 40320, while the sum is 37.

The square root of 261580672 is about 16173.4557840927. The cubic root of 261580672 is about 639.5412337247.

The spelling of 261580672 in words is "two hundred sixty-one million, five hundred eighty thousand, six hundred seventy-two".