78018973 has 4 divisors (see below), whose sum is σ = 78036640. Its totient is φ = 78001308.

The previous prime is 78018953. The next prime is 78018991. The reversal of 78018973 is 37981087.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-78018973 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78018923) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4336 + ... + 13222.

It is an arithmetic number, because the mean of its divisors is an integer number (19509160).

Almost surely, 2^78018973 is an apocalyptic number.

It is an amenable number.

78018973 is a deficient number, since it is larger than the sum of its proper divisors (17667).

78018973 is an equidigital number, since it uses as much as digits as its factorization.

78018973 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17666.

The product of its (nonzero) digits is 84672, while the sum is 43.

The square root of 78018973 is about 8832.8349356251. The cubic root of 78018973 is about 427.3005085891.

The spelling of 78018973 in words is "seventy-eight million, eighteen thousand, nine hundred seventy-three".