261742836 has 24 divisors (see below), whose sum is σ = 611072224. Its totient is φ = 87199200.

The previous prime is 261742823. The next prime is 261742837. The reversal of 261742836 is 638247162.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 261742794 and 261742803.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261742837) 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, 21486 + ... + 31386.

Almost surely, 2^261742836 is an apocalyptic number.

It is an amenable number.

261742836 is an abundant number, since it is smaller than the sum of its proper divisors (349329388).

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

261742836 is a wasteful number, since it uses less digits than its factorization.

261742836 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12111 (or 12109 counting only the distinct ones).

The product of its digits is 96768, while the sum is 39.

The square root of 261742836 is about 16178.4682834933. The cubic root of 261742836 is about 639.6733652258.

Adding to 261742836 its reverse (638247162), we get a palindrome (899989998).

The spelling of 261742836 in words is "two hundred sixty-one million, seven hundred forty-two thousand, eight hundred thirty-six".