87538765 has 4 divisors (see below), whose sum is σ = 105046524. Its totient is φ = 70031008.

The previous prime is 87538747. The next prime is 87538771. The reversal of 87538765 is 56783578.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 11744329 + 75794436 = 3427^2 + 8706^2 .

It is a cyclic number.

It is not a de Polignac number, because 87538765 - 2¹⁵ = 87505997 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8753872 + ... + 8753881.

It is an arithmetic number, because the mean of its divisors is an integer number (26261631).

Almost surely, 2^87538765 is an apocalyptic number.

It is an amenable number.

87538765 is a deficient number, since it is larger than the sum of its proper divisors (17507759).

87538765 is a wasteful number, since it uses less digits than its factorization.

87538765 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17507758.

The product of its digits is 1411200, while the sum is 49.

The square root of 87538765 is about 9356.2153138970. The cubic root of 87538765 is about 444.0175523321.

The spelling of 87538765 in words is "eighty-seven million, five hundred thirty-eight thousand, seven hundred sixty-five".