87019720 has 32 divisors (see below), whose sum is σ = 202548600. Its totient is φ = 33607168.

The previous prime is 87019717. The next prime is 87019721. The reversal of 87019720 is 2791078.

It can be written as a sum of positive squares in 4 ways, for example, as 60000516 + 27019204 = 7746^2 + 5198^2 .

It is not an unprimeable number, because it can be changed into a prime (87019721) 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, 36349 + ... + 38668.

Almost surely, 2^87019720 is an apocalyptic number.

It is an amenable number.

87019720 is an abundant number, since it is smaller than the sum of its proper divisors (115528880).

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

87019720 is a wasteful number, since it uses less digits than its factorization.

87019720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 75057 (or 75053 counting only the distinct ones).

The product of its (nonzero) digits is 7056, while the sum is 34.

The square root of 87019720 is about 9328.4360961525. The cubic root of 87019720 is about 443.1382386666.

The spelling of 87019720 in words is "eighty-seven million, nineteen thousand, seven hundred twenty".