78111983 has 8 divisors (see below), whose sum is σ = 83775600. Its totient is φ = 72603648.

The previous prime is 78111973. The next prime is 78111997. The reversal of 78111983 is 38911187.

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 78111983 - 2⁸ = 78111727 is a prime.

It is a super-2 number, since 2×78111983² = 12202963776384578, 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 (78111973) 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, 37778 + ... + 39791.

It is an arithmetic number, because the mean of its divisors is an integer number (10471950).

Almost surely, 2^78111983 is an apocalyptic number.

78111983 is a deficient number, since it is larger than the sum of its proper divisors (5663617).

78111983 is a wasteful number, since it uses less digits than its factorization.

78111983 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 77641.

The product of its digits is 12096, while the sum is 38.

The square root of 78111983 is about 8838.0983814393. The cubic root of 78111983 is about 427.4702426764.

The spelling of 78111983 in words is "seventy-eight million, one hundred eleven thousand, nine hundred eighty-three".