781069696 has 128 divisors (see below), whose sum is σ = 1797811200. Its totient is φ = 334540800.

The previous prime is 781069669. The next prime is 781069699. The reversal of 781069696 is 696960187.

It is a tau number, because it is divible by the number of its divisors (128).

It is a super-2 number, since 2×781069696² = 1220139740019064832, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (781069699) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2882041 + ... + 2882311.

It is an arithmetic number, because the mean of its divisors is an integer number (14045400).

Almost surely, 2^781069696 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 781069696, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (898905600).

781069696 is an abundant number, since it is smaller than the sum of its proper divisors (1016741504).

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

781069696 is a wasteful number, since it uses less digits than its factorization.

781069696 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 408 (or 396 counting only the distinct ones).

The product of its (nonzero) digits is 979776, while the sum is 52.

The square root of 781069696 is about 27947.6241566256. The cubic root of 781069696 is about 920.9370163431.

The spelling of 781069696 in words is "seven hundred eighty-one million, sixty-nine thousand, six hundred ninety-six".