261672806 has 32 divisors (see below), whose sum is σ = 432397440. Its totient is φ = 118250496.

The previous prime is 261672799. The next prime is 261672809. The reversal of 261672806 is 608276162.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 261672806.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261672809) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 98066 + ... + 100698.

It is an arithmetic number, because the mean of its divisors is an integer number (13512420).

Almost surely, 2^261672806 is an apocalyptic number.

261672806 is a deficient number, since it is larger than the sum of its proper divisors (170724634).

261672806 is a wasteful number, since it uses less digits than its factorization.

261672806 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2768.

The product of its (nonzero) digits is 48384, while the sum is 38.

The square root of 261672806 is about 16176.3038423492. The cubic root of 261672806 is about 639.6163113606.

The spelling of 261672806 in words is "two hundred sixty-one million, six hundred seventy-two thousand, eight hundred six".