87538021 has 4 divisors (see below), whose sum is σ = 87727552. Its totient is φ = 87348492.

The previous prime is 87537991. The next prime is 87538027. The reversal of 87538021 is 12083578.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 87538021 - 2⁹ = 87537509 is a prime.

It is a super-3 number, since 3×87538021³ (a number of 25 digits) contains 333 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 (87538027) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 94071 + ... + 94996.

It is an arithmetic number, because the mean of its divisors is an integer number (21931888).

Almost surely, 2^87538021 is an apocalyptic number.

It is an amenable number.

87538021 is a deficient number, since it is larger than the sum of its proper divisors (189531).

87538021 is a wasteful number, since it uses less digits than its factorization.

87538021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 189530.

The product of its (nonzero) digits is 13440, while the sum is 34.

The square root of 87538021 is about 9356.1755541460. The cubic root of 87538021 is about 444.0162944132.

The spelling of 87538021 in words is "eighty-seven million, five hundred thirty-eight thousand, twenty-one".