87681721000 has 32 divisors (see below), whose sum is σ = 205175229480. Its totient is φ = 35072688000.

The previous prime is 87681720979. The next prime is 87681721019. The reversal of 87681721000 is 12718678.

It can be written as a sum of positive squares in 4 ways, for example, as 6227419396 + 81454301604 = 78914^2 + 285402^2 .

It is a Harshad number since it is a multiple of its sum of digits (40).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 43839861 + ... + 43841860.

Almost surely, 2^87681721000 is an apocalyptic number.

It is an amenable number.

87681721000 is an abundant number, since it is smaller than the sum of its proper divisors (117493508480).

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

87681721000 is a wasteful number, since it uses less digits than its factorization.

87681721000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 87681742 (or 87681728 counting only the distinct ones).

The product of its (nonzero) digits is 37632, while the sum is 40.

The spelling of 87681721000 in words is "eighty-seven billion, six hundred eighty-one million, seven hundred twenty-one thousand".