78870389 has 8 divisors (see below), whose sum is σ = 85015392. Its totient is φ = 72736560.

The previous prime is 78870373. The next prime is 78870403. The reversal of 78870389 is 98307887.

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

It is not a de Polignac number, because 78870389 - 2⁴ = 78870373 is a prime.

It is a super-2 number, since 2×78870389² = 12441076522022642, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78870359) 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, 17234 + ... + 21324.

It is an arithmetic number, because the mean of its divisors is an integer number (10626924).

Almost surely, 2^78870389 is an apocalyptic number.

It is an amenable number.

78870389 is a deficient number, since it is larger than the sum of its proper divisors (6145003).

78870389 is a wasteful number, since it uses less digits than its factorization.

78870389 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5587.

The product of its (nonzero) digits is 677376, while the sum is 50.

The square root of 78870389 is about 8880.9002358995. The cubic root of 78870389 is about 428.8492559773.

The spelling of 78870389 in words is "seventy-eight million, eight hundred seventy thousand, three hundred eighty-nine".