74785553 has 2 divisors, whose sum is σ = 74785554. Its totient is φ = 74785552.

The previous prime is 74785549. The next prime is 74785559. The reversal of 74785553 is 35558747.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 43335889 + 31449664 = 6583^2 + 5608^2 .

It is a cyclic number.

It is not a de Polignac number, because 74785553 - 2² = 74785549 is a prime.

It is not a weakly prime, because it can be changed into another prime (74785559) 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 as a sum of consecutive naturals, namely, 37392776 + 37392777.

It is an arithmetic number, because the mean of its divisors is an integer number (37392777).

Almost surely, 2^74785553 is an apocalyptic number.

It is an amenable number.

74785553 is a deficient number, since it is larger than the sum of its proper divisors (1).

74785553 is an equidigital number, since it uses as much as digits as its factorization.

74785553 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 588000, while the sum is 44.

The square root of 74785553 is about 8647.8640715497. The cubic root of 74785553 is about 421.3140120565.

It can be divided in two parts, 7478 and 5553, that added together give a palindrome (13031).

The spelling of 74785553 in words is "seventy-four million, seven hundred eighty-five thousand, five hundred fifty-three".