774187678644 has 12 divisors (see below), whose sum is σ = 1806437916864. Its totient is φ = 258062559544.

The previous prime is 774187678603. The next prime is 774187678681. The reversal of 774187678644 is 446876781477.

774187678644 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (12).

It is a Smith number, since the sum of its digits (69) coincides with the sum of the digits of its prime factors.

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, 32257819932 + ... + 32257819955.

It is an arithmetic number, because the mean of its divisors is an integer number (150536493072).

Almost surely, 2^774187678644 is an apocalyptic number.

It is an amenable number.

774187678644 is an abundant number, since it is smaller than the sum of its proper divisors (1032250238220).

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

774187678644 is a wasteful number, since it uses less digits than its factorization.

774187678644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64515639894 (or 64515639892 counting only the distinct ones).

The product of its digits is 354041856, while the sum is 69.

The spelling of 774187678644 in words is "seven hundred seventy-four billion, one hundred eighty-seven million, six hundred seventy-eight thousand, six hundred forty-four".