87236641781 has 8 divisors (see below), whose sum is σ = 91871057280. Its totient is φ = 82606527648.

The previous prime is 87236641777. The next prime is 87236641783. The reversal of 87236641781 is 18714663278.

It is a happy number.

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 87236641781 - 2² = 87236641777 is a prime.

It is a super-2 number, since 2×87236641781² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (87236641783) 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, 1033661 + ... + 1114866.

It is an arithmetic number, because the mean of its divisors is an integer number (11483882160).

Almost surely, 2^87236641781 is an apocalyptic number.

It is an amenable number.

87236641781 is a deficient number, since it is larger than the sum of its proper divisors (4634415499).

87236641781 is a wasteful number, since it uses less digits than its factorization.

87236641781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2150683.

The product of its digits is 2709504, while the sum is 53.

The spelling of 87236641781 in words is "eighty-seven billion, two hundred thirty-six million, six hundred forty-one thousand, seven hundred eighty-one".