78870373 has 2 divisors, whose sum is σ = 78870374. Its totient is φ = 78870372.

The previous prime is 78870359. The next prime is 78870403. The reversal of 78870373 is 37307887.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 71351809 + 7518564 = 8447^2 + 2742^2 .

It is a cyclic number.

It is not a de Polignac number, because 78870373 - 2¹⁷ = 78739301 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78870313) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39435186 + 39435187.

It is an arithmetic number, because the mean of its divisors is an integer number (39435187).

Almost surely, 2^78870373 is an apocalyptic number.

It is an amenable number.

78870373 is a deficient number, since it is larger than the sum of its proper divisors (1).

78870373 is an equidigital number, since it uses as much as digits as its factorization.

78870373 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 197568, while the sum is 43.

The square root of 78870373 is about 8880.8993350899. The cubic root of 78870373 is about 428.8492269779.

The spelling of 78870373 in words is "seventy-eight million, eight hundred seventy thousand, three hundred seventy-three".