87019728 has 40 divisors (see below), whose sum is σ = 232056576.
Its totient is φ = 28070400.
The previous prime is 87019727. The next prime is 87019747. The reversal of 87019728 is 82791078.
It is a super-2 number, since 2×870197282 = 15144866122387968, which contains 22 as substring.
It is a self number, because there is not a number n which added to its sum of digits gives 87019728.
It is a congruent number.
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, 27753 + ... + 30728.
Almost surely, 287019728 is an apocalyptic number.
It is an amenable number.
87019728 is an abundant number, since it is smaller than the sum of its proper divisors (145036848).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
87019728 is a wasteful number, since it uses less digits than its factorization.
87019728 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 58523 (or 58517 counting only the distinct ones).
The product of its (nonzero) digits is 56448, while the sum is 42.
The square root of 87019728 is about 9328.4365249489.
The cubic root of 87019728 is about 443.1382522463.
The spelling of 87019728 in words is "eighty-seven million, nineteen thousand, seven hundred twenty-eight".