78958973 has 2 divisors, whose sum is σ = 78958974. Its totient is φ = 78958972.

The previous prime is 78958969. The next prime is 78959009. The reversal of 78958973 is 37985987.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 47844889 + 31114084 = 6917^2 + 5578^2 .

It is a cyclic number.

It is not a de Polignac number, because 78958973 - 2² = 78958969 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78958273) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39479486 + 39479487.

It is an arithmetic number, because the mean of its divisors is an integer number (39479487).

Almost surely, 2^78958973 is an apocalyptic number.

It is an amenable number.

78958973 is a deficient number, since it is larger than the sum of its proper divisors (1).

78958973 is an equidigital number, since it uses as much as digits as its factorization.

78958973 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3810240, while the sum is 56.

The square root of 78958973 is about 8885.8861685259. The cubic root of 78958973 is about 429.0097512287.

The spelling of 78958973 in words is "seventy-eight million, nine hundred fifty-eight thousand, nine hundred seventy-three".