261875650 has 48 divisors (see below), whose sum is σ = 525562344. Its totient is φ = 96711680.

The previous prime is 261875639. The next prime is 261875659. The reversal of 261875650 is 56578162.

It can be written as a sum of positive squares in 12 ways, for example, as 86657481 + 175218169 = 9309^2 + 13237^2 .

It is a hoax number, since the sum of its digits (40) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (261875659) 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, 42144 + ... + 47956.

Almost surely, 2^261875650 is an apocalyptic number.

261875650 is an abundant number, since it is smaller than the sum of its proper divisors (263686694).

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

261875650 is a wasteful number, since it uses less digits than its factorization.

261875650 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5895 (or 5890 counting only the distinct ones).

The product of its (nonzero) digits is 100800, while the sum is 40.

The square root of 261875650 is about 16182.5724160283. The cubic root of 261875650 is about 639.7815416506.

The spelling of 261875650 in words is "two hundred sixty-one million, eight hundred seventy-five thousand, six hundred fifty".