138777628 has 12 divisors (see below), whose sum is σ = 264939192. Its totient is φ = 63080720.

The previous prime is 138777619. The next prime is 138777629. The reversal of 138777628 is 826777831.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138777629) 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, 1576975 + ... + 1577062.

It is an arithmetic number, because the mean of its divisors is an integer number (22078266).

Almost surely, 2^138777628 is an apocalyptic number.

It is an amenable number.

138777628 is a deficient number, since it is larger than the sum of its proper divisors (126161564).

138777628 is a wasteful number, since it uses less digits than its factorization.

138777628 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3154052 (or 3154050 counting only the distinct ones).

The product of its digits is 790272, while the sum is 49.

The square root of 138777628 is about 11780.3916743035. The cubic root of 138777628 is about 517.7337620032.

The spelling of 138777628 in words is "one hundred thirty-eight million, seven hundred seventy-seven thousand, six hundred twenty-eight".