87831477028 has 6 divisors (see below), whose sum is σ = 153705084806. Its totient is φ = 43915738512.

The previous prime is 87831476983. The next prime is 87831477029. The reversal of 87831477028 is 82077413878.

It can be written as a sum of positive squares in only one way, i.e., 87401827044 + 429649984 = 295638^2 + 20728^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 87831477028.

It is not an unprimeable number, because it can be changed into a prime (87831477029) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10978934625 + ... + 10978934632.

Almost surely, 2^87831477028 is an apocalyptic number.

It is an amenable number.

87831477028 is a deficient number, since it is larger than the sum of its proper divisors (65873607778).

87831477028 is a wasteful number, since it uses less digits than its factorization.

87831477028 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21957869261 (or 21957869259 counting only the distinct ones).

The product of its (nonzero) digits is 4214784, while the sum is 55.

The spelling of 87831477028 in words is "eighty-seven billion, eight hundred thirty-one million, four hundred seventy-seven thousand, twenty-eight".