78734137 has 2 divisors, whose sum is σ = 78734138. Its totient is φ = 78734136.

The previous prime is 78734111. The next prime is 78734147. The reversal of 78734137 is 73143787.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 77105961 + 1628176 = 8781^2 + 1276^2 .

It is a cyclic number.

It is not a de Polignac number, because 78734137 - 2¹¹ = 78732089 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 78734137.

It is not a weakly prime, because it can be changed into another prime (78734147) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39367068 + 39367069.

It is an arithmetic number, because the mean of its divisors is an integer number (39367069).

Almost surely, 2^78734137 is an apocalyptic number.

It is an amenable number.

78734137 is a deficient number, since it is larger than the sum of its proper divisors (1).

78734137 is an equidigital number, since it uses as much as digits as its factorization.

78734137 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 98784, while the sum is 40.

The square root of 78734137 is about 8873.2258508391. The cubic root of 78734137 is about 428.6021617696.

The spelling of 78734137 in words is "seventy-eight million, seven hundred thirty-four thousand, one hundred thirty-seven".