306799778 has 4 divisors (see below), whose sum is σ = 460199670. Its totient is φ = 153399888.

The previous prime is 306799763. The next prime is 306799811. The reversal of 306799778 is 877997603.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 877997603 = 7 ⋅125428229.

It can be written as a sum of positive squares in only one way, i.e., 156075049 + 150724729 = 12493^2 + 12277^2 .

It is a super-2 number, since 2×306799778² = 188252207561698568, which contains 22 as substring.

It is an unprimeable number.

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, 76699943 + ... + 76699946.

Almost surely, 2^306799778 is an apocalyptic number.

306799778 is a deficient number, since it is larger than the sum of its proper divisors (153399892).

306799778 is a wasteful number, since it uses less digits than its factorization.

306799778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 153399891.

The product of its (nonzero) digits is 4000752, while the sum is 56.

The square root of 306799778 is about 17515.7008994787. The cubic root of 306799778 is about 674.4529837985.

The spelling of 306799778 in words is "three hundred six million, seven hundred ninety-nine thousand, seven hundred seventy-eight".