778280004 has 18 divisors (see below), whose sum is σ = 1967318990. Its totient is φ = 259426656.

The previous prime is 778279993. The next prime is 778280011. The reversal of 778280004 is 400082877.

It can be written as a sum of positive squares in only one way, i.e., 556865604 + 221414400 = 23598^2 + 14880^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a Harshad number since it is a multiple of its sum of digits (36), and also a Moran number because the ratio is a prime number: 21618889 = 778280004 / (7 + 7 + 8 + 2 + 8 + 0 + 0 + 0 + 4).

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 10809409 + ... + 10809480.

Almost surely, 2^778280004 is an apocalyptic number.

It is an amenable number.

778280004 is an abundant number, since it is smaller than the sum of its proper divisors (1189038986).

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

778280004 is a wasteful number, since it uses less digits than its factorization.

778280004 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21618899 (or 21618894 counting only the distinct ones).

The product of its (nonzero) digits is 25088, while the sum is 36.

The square root of 778280004 is about 27897.6702253073. The cubic root of 778280004 is about 919.8392929751.

The spelling of 778280004 in words is "seven hundred seventy-eight million, two hundred eighty thousand, four".