87200000991 has 24 divisors (see below), whose sum is σ = 133443601200. Its totient is φ = 54681359616.

The previous prime is 87200000977. The next prime is 87200001001. The reversal of 87200000991 is 19900000278.

It is a happy number.

It is not a de Polignac number, because 87200000991 - 2⁷ = 87200000863 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (87200000291) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 92221 + ... + 427673.

It is an arithmetic number, because the mean of its divisors is an integer number (5560150050).

Almost surely, 2^87200000991 is an apocalyptic number.

87200000991 is a deficient number, since it is larger than the sum of its proper divisors (46243600209).

87200000991 is a wasteful number, since it uses less digits than its factorization.

87200000991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 337175 (or 337172 counting only the distinct ones).

The product of its (nonzero) digits is 9072, while the sum is 36.

The spelling of 87200000991 in words is "eighty-seven billion, two hundred million, nine hundred ninety-one", and thus it is an aban number.