73139557 has 4 divisors (see below), whose sum is σ = 73156716. Its totient is φ = 73122400.

The previous prime is 73139551. The next prime is 73139617. The reversal of 73139557 is 75593137.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 24265476 + 48874081 = 4926^2 + 6991^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-73139557 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (73139551) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3273 + ... + 12529.

It is an arithmetic number, because the mean of its divisors is an integer number (18289179).

Almost surely, 2^73139557 is an apocalyptic number.

It is an amenable number.

73139557 is a deficient number, since it is larger than the sum of its proper divisors (17159).

73139557 is an equidigital number, since it uses as much as digits as its factorization.

73139557 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17158.

The product of its digits is 99225, while the sum is 40.

The square root of 73139557 is about 8552.1668014603. The cubic root of 73139557 is about 418.2000770612.

The spelling of 73139557 in words is "seventy-three million, one hundred thirty-nine thousand, five hundred fifty-seven".