78386870 has 8 divisors (see below), whose sum is σ = 141096384. Its totient is φ = 31354744.

The previous prime is 78386843. The next prime is 78386873. The reversal of 78386870 is 7868387.

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

It is a super-2 number, since 2×78386870² = 12289002776793800, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78386873) by changing a digit.

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, 3919334 + ... + 3919353.

It is an arithmetic number, because the mean of its divisors is an integer number (17637048).

Almost surely, 2^78386870 is an apocalyptic number.

78386870 is a deficient number, since it is larger than the sum of its proper divisors (62709514).

78386870 is a wasteful number, since it uses less digits than its factorization.

78386870 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7838694.

The product of its (nonzero) digits is 451584, while the sum is 47.

The square root of 78386870 is about 8853.6359762529. The cubic root of 78386870 is about 427.9710981444.

The spelling of 78386870 in words is "seventy-eight million, three hundred eighty-six thousand, eight hundred seventy".