778295988 has 36 divisors (see below), whose sum is σ = 2052898848. Its totient is φ = 248152080.

The previous prime is 778295981. The next prime is 778296019. The reversal of 778295988 is 889592877.

It is a tau number, because it is divible by the number of its divisors (36).

It is a super-2 number, since 2×778295988² = 1211489289873792288, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (778295981) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 469158 + ... + 470813.

It is an arithmetic number, because the mean of its divisors is an integer number (57024968).

Almost surely, 2^778295988 is an apocalyptic number.

It is an amenable number.

778295988 is an abundant number, since it is smaller than the sum of its proper divisors (1274602860).

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

778295988 is a wasteful number, since it uses less digits than its factorization.

778295988 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 940004 (or 939999 counting only the distinct ones).

The product of its digits is 20321280, while the sum is 63.

The square root of 778295988 is about 27897.9566993714. The cubic root of 778295988 is about 919.8455900278.

The spelling of 778295988 in words is "seven hundred seventy-eight million, two hundred ninety-five thousand, nine hundred eighty-eight".