138778693776 has 60 divisors (see below), whose sum is σ = 388412844352. Its totient is φ = 46256557248.

The previous prime is 138778693637. The next prime is 138778693793. The reversal of 138778693776 is 677396877831.

It is a happy number.

It is a super-2 number, since 2×138778693776² (a number of 23 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (72).

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3888525 + ... + 3924051.

Almost surely, 2^138778693776 is an apocalyptic number.

138778693776 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

138778693776 is an abundant number, since it is smaller than the sum of its proper divisors (249634150576).

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

138778693776 is a wasteful number, since it uses less digits than its factorization.

138778693776 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 62668 (or 62659 counting only the distinct ones).

The product of its digits is 448084224, while the sum is 72.

The spelling of 138778693776 in words is "one hundred thirty-eight billion, seven hundred seventy-eight million, six hundred ninety-three thousand, seven hundred seventy-six".