87278840705 has 16 divisors (see below), whose sum is σ = 125996522880. Its totient is φ = 56698434432.

The previous prime is 87278840699. The next prime is 87278840707. The reversal of 87278840705 is 50704887278.

It is not a de Polignac number, because 87278840705 - 2⁴ = 87278840689 is a prime.

It is a Smith number, since the sum of its digits (56) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (87278840707) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 65622524 + ... + 65623853.

It is an arithmetic number, because the mean of its divisors is an integer number (7874782680).

Almost surely, 2^87278840705 is an apocalyptic number.

It is an amenable number.

87278840705 is a deficient number, since it is larger than the sum of its proper divisors (38717682175).

87278840705 is a wasteful number, since it uses less digits than its factorization.

87278840705 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 131246408.

The product of its (nonzero) digits is 7024640, while the sum is 56.

The spelling of 87278840705 in words is "eighty-seven billion, two hundred seventy-eight million, eight hundred forty thousand, seven hundred five".