77181338 has 8 divisors (see below), whose sum is σ = 124677588. Its totient is φ = 35622144.

The previous prime is 77181337. The next prime is 77181361. The reversal of 77181338 is 83318177.

It can be written as a sum of positive squares in 2 ways, for example, as 64529089 + 12652249 = 8033^2 + 3557^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (77181337) 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 3 ways as a sum of consecutive naturals, for example, 1484231 + ... + 1484282.

Almost surely, 2^77181338 is an apocalyptic number.

77181338 is a deficient number, since it is larger than the sum of its proper divisors (47496250).

77181338 is a wasteful number, since it uses less digits than its factorization.

77181338 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2968528.

The product of its digits is 28224, while the sum is 38.

The square root of 77181338 is about 8785.2910025793. The cubic root of 77181338 is about 425.7657943964.

The spelling of 77181338 in words is "seventy-seven million, one hundred eighty-one thousand, three hundred thirty-eight".