261641208 has 32 divisors (see below), whose sum is σ = 671783760. Its totient is φ = 84856320.

The previous prime is 261641179. The next prime is 261641249. The reversal of 261641208 is 802146162.

It is a super-2 number, since 2×261641208² = 136912243447398528, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 146433 + ... + 148208.

Almost surely, 2^261641208 is an apocalyptic number.

It is an amenable number.

261641208 is an abundant number, since it is smaller than the sum of its proper divisors (410142552).

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

261641208 is a wasteful number, since it uses less digits than its factorization.

261641208 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 294687 (or 294683 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 30.

The square root of 261641208 is about 16175.3271373410. The cubic root of 261641208 is about 639.5905649459.

It can be divided in two parts, 26164 and 1208, that added together give a palindrome (27372).

The spelling of 261641208 in words is "two hundred sixty-one million, six hundred forty-one thousand, two hundred eight".