87219028 has 48 divisors (see below), whose sum is σ = 169795584. Its totient is φ = 38949120.

The previous prime is 87219023. The next prime is 87219029. The reversal of 87219028 is 82091278.

87219028 is a nontrivial binomial coefficient, being equal to C(13208, 2).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (87219023) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 310248 + ... + 310528.

It is an arithmetic number, because the mean of its divisors is an integer number (3537408).

Almost surely, 2^87219028 is an apocalyptic number.

87219028 is the 13207-th triangular number and also the 6604-th hexagonal number.

87219028 is the 4403-rd centered nonagonal number.

It is an amenable number.

87219028 is a deficient number, since it is larger than the sum of its proper divisors (82576556).

87219028 is a wasteful number, since it uses less digits than its factorization.

87219028 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 472 (or 470 counting only the distinct ones).

The product of its (nonzero) digits is 16128, while the sum is 37.

The square root of 87219028 is about 9339.1128058290. The cubic root of 87219028 is about 443.4762986384.

It can be divided in two parts, 872 and 19028, that added together give a triangular number (19900 = T₁₉₉).

The spelling of 87219028 in words is "eighty-seven million, two hundred nineteen thousand, twenty-eight".