781016868 has 36 divisors (see below), whose sum is σ = 2027598300. Its totient is φ = 253302336.

The previous prime is 781016849. The next prime is 781016921. The reversal of 781016868 is 868610187.

It can be written as a sum of positive squares in 2 ways, for example, as 343286784 + 437730084 = 18528^2 + 20922^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 291843 + ... + 294506.

It is an arithmetic number, because the mean of its divisors is an integer number (56322175).

Almost surely, 2^781016868 is an apocalyptic number.

It is an amenable number.

781016868 is an abundant number, since it is smaller than the sum of its proper divisors (1246581432).

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

781016868 is a wasteful number, since it uses less digits than its factorization.

781016868 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 586396 (or 586391 counting only the distinct ones).

The product of its (nonzero) digits is 129024, while the sum is 45.

The square root of 781016868 is about 27946.6790155825. The cubic root of 781016868 is about 920.9162532119.

The spelling of 781016868 in words is "seven hundred eighty-one million, sixteen thousand, eight hundred sixty-eight".