261087678 has 32 divisors (see below), whose sum is σ = 581126400. Its totient is φ = 86889528.

The previous prime is 261087587. The next prime is 261087689. The reversal of 261087678 is 876780162.

It is a hoax number, since the sum of its digits (45) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 33343 + ... + 40421.

It is an arithmetic number, because the mean of its divisors is an integer number (18160200).

Almost surely, 2^261087678 is an apocalyptic number.

261087678 is an abundant number, since it is smaller than the sum of its proper divisors (320038722).

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

261087678 is a wasteful number, since it uses less digits than its factorization.

261087678 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7773 (or 7767 counting only the distinct ones).

The product of its (nonzero) digits is 225792, while the sum is 45.

The square root of 261087678 is about 16158.2077595258. The cubic root of 261087678 is about 639.1392057142.

The spelling of 261087678 in words is "two hundred sixty-one million, eighty-seven thousand, six hundred seventy-eight".