781361406408 has 32 divisors (see below), whose sum is σ = 2130985654560. Its totient is φ = 236776183680.

The previous prime is 781361406389. The next prime is 781361406409. The reversal of 781361406408 is 804604163187.

781361406408 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×781361406408² (a number of 25 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (781361406409) 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, 1479850885 + ... + 1479851412.

It is an arithmetic number, because the mean of its divisors is an integer number (66593301705).

Almost surely, 2^781361406408 is an apocalyptic number.

It is an amenable number.

781361406408 is an abundant number, since it is smaller than the sum of its proper divisors (1349624248152).

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

781361406408 is a wasteful number, since it uses less digits than its factorization.

781361406408 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2959702317 (or 2959702313 counting only the distinct ones).

The product of its (nonzero) digits is 774144, while the sum is 48.

The spelling of 781361406408 in words is "seven hundred eighty-one billion, three hundred sixty-one million, four hundred six thousand, four hundred eight".