77987573 has 2 divisors, whose sum is σ = 77987574. Its totient is φ = 77987572.

The previous prime is 77987561. The next prime is 77987587. The reversal of 77987573 is 37578977.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 39025009 + 38962564 = 6247^2 + 6242^2 .

It is an emirp because it is prime and its reverse (37578977) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 77987573 - 2¹⁴ = 77971189 is a prime.

It is a super-3 number, since 3×77987573³ (a number of 25 digits) contains 333 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (77981573) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38993786 + 38993787.

It is an arithmetic number, because the mean of its divisors is an integer number (38993787).

Almost surely, 2^77987573 is an apocalyptic number.

It is an amenable number.

77987573 is a deficient number, since it is larger than the sum of its proper divisors (1).

77987573 is an equidigital number, since it uses as much as digits as its factorization.

77987573 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2593080, while the sum is 53.

The square root of 77987573 is about 8831.0572979683. The cubic root of 77987573 is about 427.2431762256.

The spelling of 77987573 in words is "seventy-seven million, nine hundred eighty-seven thousand, five hundred seventy-three".