78143879 has 8 divisors (see below), whose sum is σ = 86127888. Its totient is φ = 70306560.

The previous prime is 78143861. The next prime is 78143911. The reversal of 78143879 is 97834187.

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 78143879 - 2¹² = 78139783 is a prime.

It is a super-2 number, since 2×78143879² = 12212931650333282, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78143279) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 35552 + ... + 37685.

It is an arithmetic number, because the mean of its divisors is an integer number (10765986).

Almost surely, 2^78143879 is an apocalyptic number.

78143879 is a deficient number, since it is larger than the sum of its proper divisors (7984009).

78143879 is a wasteful number, since it uses less digits than its factorization.

78143879 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 73345.

The product of its digits is 338688, while the sum is 47.

The square root of 78143879 is about 8839.9026578351. The cubic root of 78143879 is about 427.5284187074.

The spelling of 78143879 in words is "seventy-eight million, one hundred forty-three thousand, eight hundred seventy-nine".