781828636 has 12 divisors (see below), whose sum is σ = 1372078512. Its totient is φ = 389806208.

The previous prime is 781828591. The next prime is 781828651. The reversal of 781828636 is 636828187.

It is a super-2 number, since 2×781828636² = 1222512032139240992, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 781828636.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 275440 + ... + 278263.

It is an arithmetic number, because the mean of its divisors is an integer number (114339876).

Almost surely, 2^781828636 is an apocalyptic number.

It is an amenable number.

781828636 is a deficient number, since it is larger than the sum of its proper divisors (590249876).

781828636 is a wasteful number, since it uses less digits than its factorization.

781828636 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 554060 (or 554058 counting only the distinct ones).

The product of its digits is 774144, while the sum is 49.

The square root of 781828636 is about 27961.1987582793. The cubic root of 781828636 is about 921.2352012926.

The spelling of 781828636 in words is "seven hundred eighty-one million, eight hundred twenty-eight thousand, six hundred thirty-six".