774681138 has 64 divisors (see below), whose sum is σ = 2146314240. Its totient is φ = 201214800.

The previous prime is 774681133. The next prime is 774681157. The reversal of 774681138 is 831186477.

774681138 is a `hidden beast` number, since 77 + 468 + 113 + 8 = 666.

It is a junction number, because it is equal to n+sod(n) for n = 774681093 and 774681102.

It is not an unprimeable number, because it can be changed into a prime (774681133) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 88998 + ... + 97313.

It is an arithmetic number, because the mean of its divisors is an integer number (33536160).

Almost surely, 2^774681138 is an apocalyptic number.

774681138 is an abundant number, since it is smaller than the sum of its proper divisors (1371633102).

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

774681138 is a wasteful number, since it uses less digits than its factorization.

774681138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 186340 (or 186334 counting only the distinct ones).

The product of its digits is 225792, while the sum is 45.

The square root of 774681138 is about 27833.0942943827. The cubic root of 774681138 is about 918.4192838841.

It can be divided in two parts, 77468 and 1138, that added together give a triangular number (78606 = T₃₉₆).

The spelling of 774681138 in words is "seven hundred seventy-four million, six hundred eighty-one thousand, one hundred thirty-eight".