87742987765 has 8 divisors (see below), whose sum is σ = 105298172928. Its totient is φ = 70189998480.

The previous prime is 87742987747. The next prime is 87742987771. The reversal of 87742987765 is 56778924778.

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

It is not a de Polignac number, because 87742987765 - 2⁵ = 87742987733 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 87742987694 and 87742987703.

It is a congruent number.

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, 459741 + ... + 621970.

It is an arithmetic number, because the mean of its divisors is an integer number (13162271616).

Almost surely, 2^87742987765 is an apocalyptic number.

It is an amenable number.

87742987765 is a deficient number, since it is larger than the sum of its proper divisors (17555185163).

87742987765 is a wasteful number, since it uses less digits than its factorization.

87742987765 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1097939.

The product of its digits is 331914240, while the sum is 70.

The spelling of 87742987765 in words is "eighty-seven billion, seven hundred forty-two million, nine hundred eighty-seven thousand, seven hundred sixty-five".