84078028 has 12 divisors (see below), whose sum is σ = 147238672. Its totient is φ = 42009840.

The previous prime is 84078017. The next prime is 84078067. The reversal of 84078028 is 82087048.

84078028 is a nontrivial binomial coefficient, being equal to C(12968, 2).

It is a super-2 number, since 2×84078028² = 14138229584737568, which contains 22 as substring.

It is a hoax number, since the sum of its digits (37) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 1 + ... + 12967.

Almost surely, 2^84078028 is an apocalyptic number.

84078028 is the 12967-th triangular number and also the 6484-th hexagonal number.

84078028 is the 4323-rd centered nonagonal number.

It is an amenable number.

84078028 is a deficient number, since it is larger than the sum of its proper divisors (63160644).

84078028 is a wasteful number, since it uses less digits than its factorization.

84078028 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14592 (or 14590 counting only the distinct ones).

The product of its (nonzero) digits is 28672, while the sum is 37.

The square root of 84078028 is about 9169.4071782204. The cubic root of 84078028 is about 438.0874772285.

The spelling of 84078028 in words is "eighty-four million, seventy-eight thousand, twenty-eight".