778122240 has 176 divisors, whose sum is σ = 2844707712. Its totient is φ = 177831936.

The previous prime is 778122239. The next prime is 778122259. The reversal of 778122240 is 42221877.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 103902 + ... + 111138.

It is an arithmetic number, because the mean of its divisors is an integer number (16163112).

Almost surely, 2^778122240 is an apocalyptic number.

778122240 is a gapful number since it is divisible by the number (70) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 778122240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1422353856).

778122240 is an abundant number, since it is smaller than the sum of its proper divisors (2066585472).

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

778122240 is a wasteful number, since it uses less digits than its factorization.

778122240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7272 (or 7254 counting only the distinct ones).

The product of its (nonzero) digits is 12544, while the sum is 33.

The square root of 778122240 is about 27894.8425340599. The cubic root of 778122240 is about 919.7771356829. Note that the first 3 decimals are identical.

The spelling of 778122240 in words is "seven hundred seventy-eight million, one hundred twenty-two thousand, two hundred forty".