87721775716090 has 16 divisors (see below), whose sum is σ = 157900778960040. Its totient is φ = 35088358581760.

The previous prime is 87721775716087. The next prime is 87721775716117. The reversal of 87721775716090 is 9061757712778.

It can be written as a sum of positive squares in 4 ways, for example, as 87660319818681 + 61455897409 = 9362709^2 + 247903^2 .

It is a super-3 number, since 3×87721775716090³ (a number of 43 digits) contains 333 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 42914335 + ... + 44911954.

Almost surely, 2^{87721775716090} is an apocalyptic number.

87721775716090 is a deficient number, since it is larger than the sum of its proper divisors (70179003243950).

87721775716090 is a wasteful number, since it uses less digits than its factorization.

87721775716090 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 87926177.

The product of its (nonzero) digits is 72606240, while the sum is 67.

The spelling of 87721775716090 in words is "eighty-seven trillion, seven hundred twenty-one billion, seven hundred seventy-five million, seven hundred sixteen thousand, ninety".