261217674 has 24 divisors (see below), whose sum is σ = 585489060. Its totient is φ = 84069888.

The previous prime is 261217543. The next prime is 261217741. The reversal of 261217674 is 476712162.

It can be written as a sum of positive squares in 2 ways, for example, as 259435449 + 1782225 = 16107^2 + 1335^2 .

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 249687 + ... + 250730.

Almost surely, 2^261217674 is an apocalyptic number.

261217674 is an abundant number, since it is smaller than the sum of its proper divisors (324271386).

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

261217674 is a wasteful number, since it uses less digits than its factorization.

261217674 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 500454 (or 500451 counting only the distinct ones).

The product of its digits is 28224, while the sum is 36.

The square root of 261217674 is about 16162.2298585313. The cubic root of 261217674 is about 639.2452642806.

The spelling of 261217674 in words is "two hundred sixty-one million, two hundred seventeen thousand, six hundred seventy-four".