87978080667 has 4 divisors (see below), whose sum is σ = 117304107560. Its totient is φ = 58652053776.

The previous prime is 87978080653. The next prime is 87978080677. The reversal of 87978080667 is 76608087978.

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

It is not a de Polignac number, because 87978080667 - 2¹⁹ = 87977556379 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 87978080598 and 87978080607.

It is not an unprimeable number, because it can be changed into a prime (87978080647) 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, 14663013442 + ... + 14663013447.

It is an arithmetic number, because the mean of its divisors is an integer number (29326026890).

Almost surely, 2^87978080667 is an apocalyptic number.

87978080667 is a deficient number, since it is larger than the sum of its proper divisors (29326026893).

87978080667 is a wasteful number, since it uses less digits than its factorization.

87978080667 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29326026892.

The product of its (nonzero) digits is 56899584, while the sum is 66.

The spelling of 87978080667 in words is "eighty-seven billion, nine hundred seventy-eight million, eighty thousand, six hundred sixty-seven".