77718438 has 48 divisors (see below), whose sum is σ = 192959520. Its totient is φ = 22146048.

The previous prime is 77718427. The next prime is 77718439. The reversal of 77718438 is 83481777.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 77718393 and 77718402.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77718439) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 72168 + ... + 73236.

It is an arithmetic number, because the mean of its divisors is an integer number (4019990).

Almost surely, 2^77718438 is an apocalyptic number.

77718438 is an abundant number, since it is smaller than the sum of its proper divisors (115241082).

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

77718438 is a wasteful number, since it uses less digits than its factorization.

77718438 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1661 (or 1658 counting only the distinct ones).

The product of its digits is 263424, while the sum is 45.

The square root of 77718438 is about 8815.8061457816. The cubic root of 77718438 is about 426.7511379248.

The spelling of 77718438 in words is "seventy-seven million, seven hundred eighteen thousand, four hundred thirty-eight".