778256040 has 64 divisors (see below), whose sum is σ = 2341584000. Its totient is φ = 206929152.

The previous prime is 778256029. The next prime is 778256053. The reversal of 778256040 is 40652877.

It is a self number, because there is not a number n which added to its sum of digits gives 778256040.

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, 32589 + ... + 51171.

It is an arithmetic number, because the mean of its divisors is an integer number (36587250).

Almost surely, 2^778256040 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 778256040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1170792000).

778256040 is an abundant number, since it is smaller than the sum of its proper divisors (1563327960).

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

778256040 is a wasteful number, since it uses less digits than its factorization.

778256040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18946 (or 18942 counting only the distinct ones).

The product of its (nonzero) digits is 94080, while the sum is 39.

The square root of 778256040 is about 27897.2407237705. The cubic root of 778256040 is about 919.8298519620.

The spelling of 778256040 in words is "seven hundred seventy-eight million, two hundred fifty-six thousand, forty".