1077809778 has 24 divisors (see below), whose sum is σ = 2398370988. Its totient is φ = 349559712.

The previous prime is 1077809773. The next prime is 1077809779. The reversal of 1077809778 is 8779087701.

It can be written as a sum of positive squares in 2 ways, for example, as 1067524929 + 10284849 = 32673^2 + 3207^2 .

It is not an unprimeable number, because it can be changed into a prime (1077809773) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 808501 + ... + 809832.

Almost surely, 2^1077809778 is an apocalyptic number.

1077809778 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

1077809778 is an abundant number, since it is smaller than the sum of its proper divisors (1320561210).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1077809778 is a wasteful number, since it uses less digits than its factorization.

1077809778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1618378 (or 1618375 counting only the distinct ones).

The product of its (nonzero) digits is 1382976, while the sum is 54.

The square root of 1077809778 is about 32830.0133719132. The cubic root of 1077809778 is about 1025.2915380900.

The spelling of 1077809778 in words is "one billion, seventy-seven million, eight hundred nine thousand, seven hundred seventy-eight".