87639523 has 8 divisors (see below), whose sum is σ = 88750368. Its totient is φ = 86534784.

The previous prime is 87639521. The next prime is 87639529. The reversal of 87639523 is 32593678.

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 87639523 - 2¹ = 87639521 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 87639523.

It is not an unprimeable number, because it can be changed into a prime (87639521) 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, 31786 + ... + 34432.

It is an arithmetic number, because the mean of its divisors is an integer number (11093796).

Almost surely, 2^87639523 is an apocalyptic number.

87639523 is a deficient number, since it is larger than the sum of its proper divisors (1110845).

87639523 is a wasteful number, since it uses less digits than its factorization.

87639523 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3053.

The product of its digits is 272160, while the sum is 43.

The square root of 87639523 is about 9361.5983143906. The cubic root of 87639523 is about 444.1878432379.

The spelling of 87639523 in words is "eighty-seven million, six hundred thirty-nine thousand, five hundred twenty-three".