73704557 has 2 divisors, whose sum is σ = 73704558. Its totient is φ = 73704556.

The previous prime is 73704541. The next prime is 73704559. The reversal of 73704557 is 75540737.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 43903876 + 29800681 = 6626^2 + 5459^2 .

It is a cyclic number.

It is not a de Polignac number, because 73704557 - 2⁴ = 73704541 is a prime.

Together with 73704559, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 73704557.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (73704559) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36852278 + 36852279.

It is an arithmetic number, because the mean of its divisors is an integer number (36852279).

Almost surely, 2^73704557 is an apocalyptic number.

It is an amenable number.

73704557 is a deficient number, since it is larger than the sum of its proper divisors (1).

73704557 is an equidigital number, since it uses as much as digits as its factorization.

73704557 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 102900, while the sum is 38.

The square root of 73704557 is about 8585.1358172134. The cubic root of 73704557 is about 419.2741753351.

The spelling of 73704557 in words is "seventy-three million, seven hundred four thousand, five hundred fifty-seven".