87063031781 has 8 divisors (see below), whose sum is σ = 97544822304. Its totient is φ = 77009069520.

The previous prime is 87063031721. The next prime is 87063031801. The reversal of 87063031781 is 18713036078.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 87063031781 - 2²⁶ = 86995922917 is a prime.

It is a super-2 number, since 2×87063031781² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (87063031711) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 106956635 + ... + 106957448.

It is an arithmetic number, because the mean of its divisors is an integer number (12193102788).

Almost surely, 2^87063031781 is an apocalyptic number.

It is an amenable number.

87063031781 is a deficient number, since it is larger than the sum of its proper divisors (10481790523).

87063031781 is a wasteful number, since it uses less digits than its factorization.

87063031781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 213914131.

The product of its (nonzero) digits is 169344, while the sum is 44.

The spelling of 87063031781 in words is "eighty-seven billion, sixty-three million, thirty-one thousand, seven hundred eighty-one".