138176778 has 64 divisors (see below), whose sum is σ = 306432000. Its totient is φ = 41342400.

The previous prime is 138176771. The next prime is 138176783. The reversal of 138176778 is 877671831.

It is a super-2 number, since 2×138176778² = 38185643956922568, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (138176771) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 395748 + ... + 396096.

It is an arithmetic number, because the mean of its divisors is an integer number (4788000).

Almost surely, 2^138176778 is an apocalyptic number.

138176778 is an abundant number, since it is smaller than the sum of its proper divisors (168255222).

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

138176778 is a wasteful number, since it uses less digits than its factorization.

138176778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 547.

The product of its digits is 395136, while the sum is 48.

The square root of 138176778 is about 11754.8618877467. The cubic root of 138176778 is about 516.9854897052.

The spelling of 138176778 in words is "one hundred thirty-eight million, one hundred seventy-six thousand, seven hundred seventy-eight".