73743778 has 4 divisors (see below), whose sum is σ = 110615670. Its totient is φ = 36871888.

The previous prime is 73743743. The next prime is 73743779. The reversal of 73743778 is 87734737.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 87734737 = 3251 ⋅26987.

It can be written as a sum of positive squares in only one way, i.e., 70107129 + 3636649 = 8373^2 + 1907^2 .

It is not an unprimeable number, because it can be changed into a prime (73743779) 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, 18435943 + ... + 18435946.

Almost surely, 2^73743778 is an apocalyptic number.

73743778 is a deficient number, since it is larger than the sum of its proper divisors (36871892).

73743778 is a wasteful number, since it uses less digits than its factorization.

73743778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36871891.

The product of its digits is 691488, while the sum is 46.

The square root of 73743778 is about 8587.4197521724. The cubic root of 73743778 is about 419.3485327294.

The spelling of 73743778 in words is "seventy-three million, seven hundred forty-three thousand, seven hundred seventy-eight".