781328632 has 16 divisors (see below), whose sum is σ = 1674275760. Its totient is φ = 334855104.

The previous prime is 781328629. The next prime is 781328633. The reversal of 781328632 is 236823187.

It is a super-2 number, since 2×781328632² = 1220948862365982848, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (781328633) 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 3 ways as a sum of consecutive naturals, for example, 6976093 + ... + 6976204.

It is an arithmetic number, because the mean of its divisors is an integer number (104642235).

Almost surely, 2^781328632 is an apocalyptic number.

It is an amenable number.

781328632 is an abundant number, since it is smaller than the sum of its proper divisors (892947128).

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

781328632 is a wasteful number, since it uses less digits than its factorization.

781328632 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13952310 (or 13952306 counting only the distinct ones).

The product of its digits is 96768, while the sum is 40.

The square root of 781328632 is about 27952.2562953333. The cubic root of 781328632 is about 921.0387731184.

Subtracting from 781328632 its reverse (236823187), we obtain a palindrome (544505445).

The spelling of 781328632 in words is "seven hundred eighty-one million, three hundred twenty-eight thousand, six hundred thirty-two".