77772008 has 16 divisors (see below), whose sum is σ = 154400580. Its totient is φ = 36598528.

The previous prime is 77772001. The next prime is 77772017. The reversal of 77772008 is 80027777.

It can be written as a sum of positive squares in 2 ways, for example, as 77757124 + 14884 = 8818^2 + 122^2 .

It is not an unprimeable number, because it can be changed into a prime (77772001) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 285791 + ... + 286062.

Almost surely, 2^77772008 is an apocalyptic number.

It is an amenable number.

77772008 is a deficient number, since it is larger than the sum of its proper divisors (76628572).

77772008 is a wasteful number, since it uses less digits than its factorization.

77772008 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 571876 (or 571872 counting only the distinct ones).

The product of its (nonzero) digits is 38416, while the sum is 38.

The square root of 77772008 is about 8818.8439151626. The cubic root of 77772008 is about 426.8491661769.

The spelling of 77772008 in words is "seventy-seven million, seven hundred seventy-two thousand, eight".