84078645 has 32 divisors (see below), whose sum is σ = 154207488. Its totient is φ = 38320128.

The previous prime is 84078619. The next prime is 84078703. The reversal of 84078645 is 54687048.

It is not a de Polignac number, because 84078645 - 2⁶ = 84078581 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 84078597 and 84078606.

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 31 ways as a sum of consecutive naturals, for example, 40677 + ... + 42693.

It is an arithmetic number, because the mean of its divisors is an integer number (4818984).

Almost surely, 2^84078645 is an apocalyptic number.

It is an amenable number.

84078645 is a deficient number, since it is larger than the sum of its proper divisors (70128843).

84078645 is a wasteful number, since it uses less digits than its factorization.

84078645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2429.

The product of its (nonzero) digits is 215040, while the sum is 42.

The square root of 84078645 is about 9169.4408226456. The cubic root of 84078645 is about 438.0885488494.

The spelling of 84078645 in words is "eighty-four million, seventy-eight thousand, six hundred forty-five".