87129756 has 120 divisors (see below), whose sum is σ = 266947296. Its totient is φ = 24261120.

The previous prime is 87129737. The next prime is 87129761. The reversal of 87129756 is 65792178.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 92520 + ... + 93456.

Almost surely, 2^87129756 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 87129756, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (133473648).

87129756 is an abundant number, since it is smaller than the sum of its proper divisors (179817540).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

87129756 is a wasteful number, since it uses less digits than its factorization.

87129756 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1001 (or 990 counting only the distinct ones).

The product of its digits is 211680, while the sum is 45.

The square root of 87129756 is about 9334.3321132259. The cubic root of 87129756 is about 443.3249420212.

The spelling of 87129756 in words is "eighty-seven million, one hundred twenty-nine thousand, seven hundred fifty-six".