87221432 has 32 divisors (see below), whose sum is σ = 172080720. Its totient is φ = 41391360.

The previous prime is 87221413. The next prime is 87221437. The reversal of 87221432 is 23412278.

It is a junction number, because it is equal to n+sod(n) for n = 87221395 and 87221404.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (87221437) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8543 + ... + 15729.

Almost surely, 2^87221432 is an apocalyptic number.

87221432 is a gapful number since it is divisible by the number (82) formed by its first and last digit.

It is an amenable number.

87221432 is a deficient number, since it is larger than the sum of its proper divisors (84859288).

87221432 is a wasteful number, since it uses less digits than its factorization.

87221432 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7271 (or 7267 counting only the distinct ones).

The product of its digits is 5376, while the sum is 29.

The square root of 87221432 is about 9339.2415109579. The cubic root of 87221432 is about 443.4803730828.

The spelling of 87221432 in words is "eighty-seven million, two hundred twenty-one thousand, four hundred thirty-two".