781255242404 has 24 divisors (see below), whose sum is σ = 1682703599808. Its totient is φ = 309068007840.

The previous prime is 781255242401. The next prime is 781255242407. The reversal of 781255242404 is 404242552187.

It is an interprime number because it is at equal distance from previous prime (781255242401) and next prime (781255242407).

It is a super-2 number, since 2×781255242404² (a number of 25 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (44) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (781255242401) 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, 1073152442 + ... + 1073153169.

It is an arithmetic number, because the mean of its divisors is an integer number (70112649992).

Almost surely, 2^781255242404 is an apocalyptic number.

It is an amenable number.

781255242404 is an abundant number, since it is smaller than the sum of its proper divisors (901448357404).

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

781255242404 is a wasteful number, since it uses less digits than its factorization.

781255242404 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2146305635 (or 2146305633 counting only the distinct ones).

The product of its (nonzero) digits is 716800, while the sum is 44.

The spelling of 781255242404 in words is "seven hundred eighty-one billion, two hundred fifty-five million, two hundred forty-two thousand, four hundred four".