138760778 has 8 divisors (see below), whose sum is σ = 224152068. Its totient is φ = 64043424.

The previous prime is 138760777. The next prime is 138760793. The reversal of 138760778 is 877067831.

It can be written as a sum of positive squares in 2 ways, for example, as 135652609 + 3108169 = 11647^2 + 1763^2 .

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

It is a super-2 number, since 2×138760778² = 38509107022330568, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (138760777) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2668451 + ... + 2668502.

Almost surely, 2^138760778 is an apocalyptic number.

138760778 is a deficient number, since it is larger than the sum of its proper divisors (85391290).

138760778 is a wasteful number, since it uses less digits than its factorization.

138760778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5336968.

The product of its (nonzero) digits is 395136, while the sum is 47.

The square root of 138760778 is about 11779.6764811263. The cubic root of 138760778 is about 517.7128072160.

The spelling of 138760778 in words is "one hundred thirty-eight million, seven hundred sixty thousand, seven hundred seventy-eight".