87221584 has 10 divisors (see below), whose sum is σ = 168991850. Its totient is φ = 43610784.

The previous prime is 87221581. The next prime is 87221591. The reversal of 87221584 is 48512278.

It can be written as a sum of positive squares in only one way, i.e., 52881984 + 34339600 = 7272^2 + 5860^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (87221581) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2725659 + ... + 2725690.

It is an arithmetic number, because the mean of its divisors is an integer number (16899185).

Almost surely, 2^87221584 is an apocalyptic number.

It is an amenable number.

87221584 is a deficient number, since it is larger than the sum of its proper divisors (81770266).

87221584 is a wasteful number, since it uses less digits than its factorization.

87221584 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5451357 (or 5451351 counting only the distinct ones).

The product of its digits is 35840, while the sum is 37.

The square root of 87221584 is about 9339.2496486602. The cubic root of 87221584 is about 443.4806306990.

The spelling of 87221584 in words is "eighty-seven million, two hundred twenty-one thousand, five hundred eighty-four".