87128392756 has 24 divisors (see below), whose sum is σ = 156127996640. Its totient is φ = 42521788512.

The previous prime is 87128392751. The next prime is 87128392781. The reversal of 87128392756 is 65729382178.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 87128392756.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (87128392751) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 77350 + ... + 424546.

Almost surely, 2^87128392756 is an apocalyptic number.

87128392756 is a gapful number since it is divisible by the number (86) formed by its first and last digit.

It is an amenable number.

87128392756 is a deficient number, since it is larger than the sum of its proper divisors (68999603884).

87128392756 is a wasteful number, since it uses less digits than its factorization.

87128392756 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 348703 (or 348701 counting only the distinct ones).

The product of its digits is 10160640, while the sum is 58.

The spelling of 87128392756 in words is "eighty-seven billion, one hundred twenty-eight million, three hundred ninety-two thousand, seven hundred fifty-six".