87191003520 has 384 divisors, whose sum is σ = 320697131040. Its totient is φ = 21752512512.

The previous prime is 87191003507. The next prime is 87191003561. The reversal of 87191003520 is 2530019178.

It is a tau number, because it is divible by the number of its divisors (384).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 16937587 + ... + 16942733.

Almost surely, 2^87191003520 is an apocalyptic number.

87191003520 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 87191003520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (160348565520).

87191003520 is an abundant number, since it is smaller than the sum of its proper divisors (233506127520).

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

87191003520 is a wasteful number, since it uses less digits than its factorization.

87191003520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5362 (or 5347 counting only the distinct ones).

The product of its (nonzero) digits is 15120, while the sum is 36.

The spelling of 87191003520 in words is "eighty-seven billion, one hundred ninety-one million, three thousand, five hundred twenty".