87427621 has 4 divisors (see below), whose sum is σ = 89560044. Its totient is φ = 85295200.

The previous prime is 87427601. The next prime is 87427679. The reversal of 87427621 is 12672478.

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 3045025 + 84382596 = 1745^2 + 9186^2 .

It is a cyclic number.

It is not a de Polignac number, because 87427621 - 2¹³ = 87419429 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (87427601) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1066150 + ... + 1066231.

It is an arithmetic number, because the mean of its divisors is an integer number (22390011).

Almost surely, 2^87427621 is an apocalyptic number.

It is an amenable number.

87427621 is a deficient number, since it is larger than the sum of its proper divisors (2132423).

87427621 is a wasteful number, since it uses less digits than its factorization.

87427621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2132422.

The product of its digits is 37632, while the sum is 37.

The square root of 87427621 is about 9350.2738462571. The cubic root of 87427621 is about 443.8295564297.

The spelling of 87427621 in words is "eighty-seven million, four hundred twenty-seven thousand, six hundred twenty-one".