78378971 has 8 divisors (see below), whose sum is σ = 90004800. Its totient is φ = 67503240.

The previous prime is 78378941. The next prime is 78378991. The reversal of 78378971 is 17987387.

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 78378971 - 2¹⁰ = 78377947 is a prime.

It is a super-2 number, since 2×78378971² = 12286526190037682, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78378901) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 187301 + ... + 187718.

It is an arithmetic number, because the mean of its divisors is an integer number (11250600).

Almost surely, 2^78378971 is an apocalyptic number.

78378971 is a deficient number, since it is larger than the sum of its proper divisors (11625829).

78378971 is a wasteful number, since it uses less digits than its factorization.

78378971 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 375049.

The product of its digits is 592704, while the sum is 50.

The square root of 78378971 is about 8853.1898771008. The cubic root of 78378971 is about 427.9567221941.

The spelling of 78378971 in words is "seventy-eight million, three hundred seventy-eight thousand, nine hundred seventy-one".