781532025804 has 72 divisors (see below), whose sum is σ = 2087246070000. Its totient is φ = 245882058624.

The previous prime is 781532025797. The next prime is 781532025809. The reversal of 781532025804 is 408520235187.

781532025804 is a `hidden beast` number, since 78 + 1 + 5 + 320 + 258 + 0 + 4 = 666.

It is a super-2 number, since 2×781532025804² (a number of 25 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 781532025804.

It is not an unprimeable number, because it can be changed into a prime (781532025809) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1939779 + ... + 2307770.

It is an arithmetic number, because the mean of its divisors is an integer number (28989528750).

Almost surely, 2^781532025804 is an apocalyptic number.

It is an amenable number.

781532025804 is an abundant number, since it is smaller than the sum of its proper divisors (1305714044196).

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

781532025804 is a wasteful number, since it uses less digits than its factorization.

781532025804 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4247847 (or 4247842 counting only the distinct ones).

The product of its (nonzero) digits is 537600, while the sum is 45.

Adding to 781532025804 its sum of digits (45), we get a square (781532025849 = 884043²).

The spelling of 781532025804 in words is "seven hundred eighty-one billion, five hundred thirty-two million, twenty-five thousand, eight hundred four".