87216720 has 40 divisors (see below), whose sum is σ = 270372576. Its totient is φ = 23257728.

The previous prime is 87216719. The next prime is 87216737. The reversal of 87216720 is 2761278.

It is a tau number, because it is divible by the number of its divisors (40).

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 181462 + ... + 181941.

Almost surely, 2^87216720 is an apocalyptic number.

87216720 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

87216720 is an abundant number, since it is smaller than the sum of its proper divisors (183155856).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

87216720 is a wasteful number, since it uses less digits than its factorization.

87216720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 363419 (or 363413 counting only the distinct ones).

The product of its (nonzero) digits is 9408, while the sum is 33.

The square root of 87216720 is about 9338.9892386703. The cubic root of 87216720 is about 443.4723868302.

Adding to 87216720 its reverse (2761278), we get a palindrome (89977998).

The spelling of 87216720 in words is "eighty-seven million, two hundred sixteen thousand, seven hundred twenty".