778247316 has 108 divisors (see below), whose sum is σ = 2471335776. Its totient is φ = 202134240.

The previous prime is 778247311. The next prime is 778247339. The reversal of 778247316 is 613742877.

It is a super-2 number, since 2×778247316² = 1211337769722407712, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (778247311) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 17731 + ... + 43253.

Almost surely, 2^778247316 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 778247316, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1235667888).

778247316 is an abundant number, since it is smaller than the sum of its proper divisors (1693088460).

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

778247316 is a wasteful number, since it uses less digits than its factorization.

778247316 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25562 (or 25546 counting only the distinct ones).

The product of its digits is 395136, while the sum is 45.

The square root of 778247316 is about 27897.0843637825. The cubic root of 778247316 is about 919.8264149502.

The spelling of 778247316 in words is "seven hundred seventy-eight million, two hundred forty-seven thousand, three hundred sixteen".