261747628 has 12 divisors (see below), whose sum is σ = 461092912. Its totient is φ = 130006800.

The previous prime is 261747611. The next prime is 261747637. The reversal of 261747628 is 826747162.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 216075 + ... + 217282.

Almost surely, 2^261747628 is an apocalyptic number.

It is an amenable number.

261747628 is a deficient number, since it is larger than the sum of its proper divisors (199345284).

261747628 is a wasteful number, since it uses less digits than its factorization.

261747628 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 433512 (or 433510 counting only the distinct ones).

The product of its digits is 225792, while the sum is 43.

The square root of 261747628 is about 16178.6163808899. The cubic root of 261747628 is about 639.6772689253.

The spelling of 261747628 in words is "two hundred sixty-one million, seven hundred forty-seven thousand, six hundred twenty-eight".