4491333778 has 4 divisors (see below), whose sum is σ = 6737000670. Its totient is φ = 2245666888.

The previous prime is 4491333731. The next prime is 4491333787. The reversal of 4491333778 is 8773331944.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 3878424729 + 612909049 = 62277^2 + 24757^2 .

It is an unprimeable number.

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, 1122833443 + ... + 1122833446.

Almost surely, 2^4491333778 is an apocalyptic number.

4491333778 is a deficient number, since it is larger than the sum of its proper divisors (2245666892).

4491333778 is a wasteful number, since it uses less digits than its factorization.

4491333778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2245666891.

The product of its digits is 1524096, while the sum is 49.

The square root of 4491333778 is about 67017.4139906935. The cubic root of 4491333778 is about 1649.9031198704.

The spelling of 4491333778 in words is "four billion, four hundred ninety-one million, three hundred thirty-three thousand, seven hundred seventy-eight".