87782179 has 4 divisors (see below), whose sum is σ = 87800976. Its totient is φ = 87763384.

The previous prime is 87782171. The next prime is 87782197. The reversal of 87782179 is 97128778.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 97128778 = 2 ⋅48564389.

It is a cyclic number.

It is not a de Polignac number, because 87782179 - 2³ = 87782171 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (87782171) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3597 + ... + 13729.

It is an arithmetic number, because the mean of its divisors is an integer number (21950244).

Almost surely, 2^87782179 is an apocalyptic number.

87782179 is a deficient number, since it is larger than the sum of its proper divisors (18797).

87782179 is a wasteful number, since it uses less digits than its factorization.

87782179 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18796.

The product of its digits is 395136, while the sum is 49.

The square root of 87782179 is about 9369.2144281151. The cubic root of 87782179 is about 444.4287228027.

The spelling of 87782179 in words is "eighty-seven million, seven hundred eighty-two thousand, one hundred seventy-nine".