78085021 has 8 divisors (see below), whose sum is σ = 90107264. Its totient is φ = 66279600.

The previous prime is 78085009. The next prime is 78085031. The reversal of 78085021 is 12058087.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 78085021 - 2¹³ = 78076829 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78085031) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 53430 + ... + 54871.

It is an arithmetic number, because the mean of its divisors is an integer number (11263408).

Almost surely, 2^78085021 is an apocalyptic number.

It is an amenable number.

78085021 is a deficient number, since it is larger than the sum of its proper divisors (12022243).

78085021 is a wasteful number, since it uses less digits than its factorization.

78085021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 108411.

The product of its (nonzero) digits is 4480, while the sum is 31.

The square root of 78085021 is about 8836.5729216705. The cubic root of 78085021 is about 427.4210535568.

The spelling of 78085021 in words is "seventy-eight million, eighty-five thousand, twenty-one".