261724772 has 24 divisors (see below), whose sum is σ = 482677440. Its totient is φ = 123832800.

The previous prime is 261724763. The next prime is 261724777. The reversal of 261724772 is 277427162.

It is a Smith number, since the sum of its digits (38) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (38).

It is not an unprimeable number, because it can be changed into a prime (261724777) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 97553 + ... + 100199.

It is an arithmetic number, because the mean of its divisors is an integer number (20111560).

Almost surely, 2^261724772 is an apocalyptic number.

It is an amenable number.

261724772 is a deficient number, since it is larger than the sum of its proper divisors (220952668).

261724772 is a wasteful number, since it uses less digits than its factorization.

261724772 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3971 (or 3969 counting only the distinct ones).

The product of its digits is 65856, while the sum is 38.

The square root of 261724772 is about 16177.9100009859. The cubic root of 261724772 is about 639.6586493497.

The spelling of 261724772 in words is "two hundred sixty-one million, seven hundred twenty-four thousand, seven hundred seventy-two".