781005428 has 12 divisors (see below), whose sum is σ = 1562010912. Its totient is φ = 334716600.

The previous prime is 781005391. The next prime is 781005473. The reversal of 781005428 is 824500187.

781005428 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

781005428 is an admirable number.

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, 13946498 + ... + 13946553.

It is an arithmetic number, because the mean of its divisors is an integer number (130167576).

Almost surely, 2^781005428 is an apocalyptic number.

It is an amenable number.

781005428 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

781005428 is a wasteful number, since it uses less digits than its factorization.

781005428 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27893062 (or 27893060 counting only the distinct ones).

The product of its (nonzero) digits is 17920, while the sum is 35.

The square root of 781005428 is about 27946.4743393509. The cubic root of 781005428 is about 920.9117567946.

The spelling of 781005428 in words is "seven hundred eighty-one million, five thousand, four hundred twenty-eight".