87905779 has 4 divisors (see below), whose sum is σ = 94667776. Its totient is φ = 81143784.

The previous prime is 87905773. The next prime is 87905813. The reversal of 87905779 is 97750978.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 87905779 - 2¹⁹ = 87381491 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (87905773) 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 3 ways as a sum of consecutive naturals, for example, 3380979 + ... + 3381004.

It is an arithmetic number, because the mean of its divisors is an integer number (23666944).

Almost surely, 2^87905779 is an apocalyptic number.

87905779 is a deficient number, since it is larger than the sum of its proper divisors (6761997).

87905779 is a wasteful number, since it uses less digits than its factorization.

87905779 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6761996.

The product of its (nonzero) digits is 1111320, while the sum is 52.

The square root of 87905779 is about 9375.8081784985. The cubic root of 87905779 is about 444.6372147358.

The spelling of 87905779 in words is "eighty-seven million, nine hundred five thousand, seven hundred seventy-nine".