261574020 has 72 divisors (see below), whose sum is σ = 794825304. Its totient is φ = 69631488.

The previous prime is 261574013. The next prime is 261574021. The reversal of 261574020 is 20475162.

261574020 is a `hidden beast` number, since 2 + 615 + 7 + 40 + 2 + 0 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 43007364 + 218566656 = 6558^2 + 14784^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261574021) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 157032 + ... + 158688.

Almost surely, 2^261574020 is an apocalyptic number.

261574020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

261574020 is an abundant number, since it is smaller than the sum of its proper divisors (533251284).

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

261574020 is a wasteful number, since it uses less digits than its factorization.

261574020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2549 (or 2544 counting only the distinct ones).

The product of its (nonzero) digits is 3360, while the sum is 27.

The square root of 261574020 is about 16173.2501371864. The cubic root of 261574020 is about 639.5358124980.

The spelling of 261574020 in words is "two hundred sixty-one million, five hundred seventy-four thousand, twenty".