778280255580 has 48 divisors (see below), whose sum is σ = 2193810141600. Its totient is φ = 206148503808.

The previous prime is 778280255527. The next prime is 778280255591. The reversal of 778280255580 is 85552082877.

It is a super-3 number, since 3×778280255580³ (a number of 37 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a self number, because there is not a number n which added to its sum of digits gives 778280255580.

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, 43519039 + ... + 43536918.

It is an arithmetic number, because the mean of its divisors is an integer number (45704377950).

Almost surely, 2^778280255580 is an apocalyptic number.

It is an amenable number.

778280255580 is an abundant number, since it is smaller than the sum of its proper divisors (1415529886020).

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

778280255580 is a wasteful number, since it uses less digits than its factorization.

778280255580 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 87056118 (or 87056116 counting only the distinct ones).

The product of its (nonzero) digits is 12544000, while the sum is 57.

The spelling of 778280255580 in words is "seven hundred seventy-eight billion, two hundred eighty million, two hundred fifty-five thousand, five hundred eighty".