778477016240 has 80 divisors (see below), whose sum is σ = 2256572355840. Its totient is φ = 242642184960.

The previous prime is 778477016201. The next prime is 778477016243. The reversal of 778477016240 is 42610774877.

It is a tau number, because it is divible by the number of its divisors (80).

It is a super-3 number, since 3×778477016240³ (a number of 37 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (778477016243) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 63181910 + ... + 63194229.

It is an arithmetic number, because the mean of its divisors is an integer number (28207154448).

Almost surely, 2^778477016240 is an apocalyptic number.

778477016240 is a gapful number since it is divisible by the number (70) formed by its first and last digit.

It is an amenable number.

778477016240 is an abundant number, since it is smaller than the sum of its proper divisors (1478095339600).

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

778477016240 is a wasteful number, since it uses less digits than its factorization.

778477016240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 126376170 (or 126376164 counting only the distinct ones).

The product of its (nonzero) digits is 3687936, while the sum is 53.

The spelling of 778477016240 in words is "seven hundred seventy-eight billion, four hundred seventy-seven million, sixteen thousand, two hundred forty".