87928082978 has 4 divisors (see below), whose sum is σ = 131892124470. Its totient is φ = 43964041488.

The previous prime is 87928082971. The next prime is 87928082999.

87928082978 is nontrivially palindromic in base 10.

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

It can be written as a sum of positive squares in only one way, i.e., 57363603049 + 30564479929 = 239507^2 + 174827^2 .

It is not an unprimeable number, because it can be changed into a prime (87928082971) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21982020743 + ... + 21982020746.

Almost surely, 2^87928082978 is an apocalyptic number.

87928082978 is a deficient number, since it is larger than the sum of its proper divisors (43964041492).

87928082978 is a wasteful number, since it uses less digits than its factorization.

87928082978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43964041491.

The product of its (nonzero) digits is 65028096, while the sum is 68.

The spelling of 87928082978 in words is "eighty-seven billion, nine hundred twenty-eight million, eighty-two thousand, nine hundred seventy-eight".