78937057 has 2 divisors, whose sum is σ = 78937058. Its totient is φ = 78937056.

The previous prime is 78937009. The next prime is 78937091. The reversal of 78937057 is 75073987.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 55935441 + 23001616 = 7479^2 + 4796^2 .

It is an emirp because it is prime and its reverse (75073987) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 78937057 - 2¹¹ = 78935009 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 78936998 and 78937016.

It is not a weakly prime, because it can be changed into another prime (78937657) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39468528 + 39468529.

It is an arithmetic number, because the mean of its divisors is an integer number (39468529).

Almost surely, 2^78937057 is an apocalyptic number.

It is an amenable number.

78937057 is a deficient number, since it is larger than the sum of its proper divisors (1).

78937057 is an equidigital number, since it uses as much as digits as its factorization.

78937057 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 370440, while the sum is 46.

The square root of 78937057 is about 8884.6528913627. The cubic root of 78937057 is about 428.9700553065.

The spelling of 78937057 in words is "seventy-eight million, nine hundred thirty-seven thousand, fifty-seven".