778257480 has 768 divisors, whose sum is σ = 3432038400. Its totient is φ = 136857600.

The previous prime is 778257457. The next prime is 778257523. The reversal of 778257480 is 84752877.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 191 ways as a sum of consecutive naturals, for example, 25105065 + ... + 25105095.

It is an arithmetic number, because the mean of its divisors is an integer number (4468800).

Almost surely, 2^778257480 is an apocalyptic number.

778257480 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 778257480, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1716019200).

778257480 is an abundant number, since it is smaller than the sum of its proper divisors (2653780920).

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

778257480 is a wasteful number, since it uses less digits than its factorization.

778257480 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 106 (or 91 counting only the distinct ones).

The product of its (nonzero) digits is 878080, while the sum is 48.

The square root of 778257480 is about 27897.2665327627. The cubic root of 778257480 is about 919.8304192792.

The spelling of 778257480 in words is "seven hundred seventy-eight million, two hundred fifty-seven thousand, four hundred eighty".