73278013 has 2 divisors, whose sum is σ = 73278014. Its totient is φ = 73278012.

The previous prime is 73278001. The next prime is 73278067. The reversal of 73278013 is 31087237.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 72284004 + 994009 = 8502^2 + 997^2 .

It is a cyclic number.

It is not a de Polignac number, because 73278013 - 2¹³ = 73269821 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (73278083) 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, 36639006 + 36639007.

It is an arithmetic number, because the mean of its divisors is an integer number (36639007).

Almost surely, 2^73278013 is an apocalyptic number.

It is an amenable number.

73278013 is a deficient number, since it is larger than the sum of its proper divisors (1).

73278013 is an equidigital number, since it uses as much as digits as its factorization.

73278013 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7056, while the sum is 31.

The square root of 73278013 is about 8560.2577648106. The cubic root of 73278013 is about 418.4638003391.

The spelling of 73278013 in words is "seventy-three million, two hundred seventy-eight thousand, thirteen".