781255528252 has 24 divisors (see below), whose sum is σ = 1386359452800. Its totient is φ = 385156175616.

The previous prime is 781255528091. The next prime is 781255528253. The reversal of 781255528252 is 252825552187.

It is a super-2 number, since 2×781255528252² (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 781255528252.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (781255528253) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 520149 + ... + 1353907.

It is an arithmetic number, because the mean of its divisors is an integer number (57764977200).

Almost surely, 2^781255528252 is an apocalyptic number.

It is an amenable number.

781255528252 is a deficient number, since it is larger than the sum of its proper divisors (605103924548).

781255528252 is a wasteful number, since it uses less digits than its factorization.

781255528252 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 837045 (or 837043 counting only the distinct ones).

The product of its digits is 4480000, while the sum is 52.

The spelling of 781255528252 in words is "seven hundred eighty-one billion, two hundred fifty-five million, five hundred twenty-eight thousand, two hundred fifty-two".