778999998 has 32 divisors (see below), whose sum is σ = 1828698624. Its totient is φ = 216555552.

The previous prime is 778999967. The next prime is 778999999. The reversal of 778999998 is 899999877.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (778999999) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 249090 + ... + 252197.

It is an arithmetic number, because the mean of its divisors is an integer number (57146832).

Almost surely, 2^778999998 is an apocalyptic number.

778999998 is an abundant number, since it is smaller than the sum of its proper divisors (1049698626).

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

778999998 is a wasteful number, since it uses less digits than its factorization.

778999998 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 501336.

The product of its digits is 185177664, while the sum is 75.

The square root of 778999998 is about 27910.5714380770. The cubic root of 778999998 is about 920.1228561514.

The spelling of 778999998 in words is "seven hundred seventy-eight million, nine hundred ninety-nine thousand, nine hundred ninety-eight".