87628521 has 8 divisors (see below), whose sum is σ = 119687904. Its totient is φ = 56994080.

The previous prime is 87628493. The next prime is 87628529. The reversal of 87628521 is 12582678.

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 87628521 - 2¹⁴ = 87612137 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 87628521.

It is not an unprimeable number, because it can be changed into a prime (87628529) 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, 356091 + ... + 356336.

It is an arithmetic number, because the mean of its divisors is an integer number (14960988).

Almost surely, 2^87628521 is an apocalyptic number.

It is an amenable number.

87628521 is a deficient number, since it is larger than the sum of its proper divisors (32059383).

87628521 is a wasteful number, since it uses less digits than its factorization.

87628521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 712471.

The product of its digits is 53760, while the sum is 39.

The square root of 87628521 is about 9361.0106826133. The cubic root of 87628521 is about 444.1692551284.

The spelling of 87628521 in words is "eighty-seven million, six hundred twenty-eight thousand, five hundred twenty-one".