138428577 has 18 divisors (see below), whose sum is σ = 232598418. Its totient is φ = 79101792.

The previous prime is 138428557. The next prime is 138428621. The reversal of 138428577 is 775824831.

138428577 is a `hidden beast` number, since 1 + 38 + 42 + 8 + 577 = 666.

It can be written as a sum of positive squares in only one way, i.e., 136328976 + 2099601 = 11676^2 + 1449^2 .

It is not a de Polignac number, because 138428577 - 2⁸ = 138428321 is a prime.

It is not an unprimeable number, because it can be changed into a prime (138428557) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 156508 + ... + 157389.

Almost surely, 2^138428577 is an apocalyptic number.

It is an amenable number.

138428577 is a deficient number, since it is larger than the sum of its proper divisors (94169841).

138428577 is a wasteful number, since it uses less digits than its factorization.

138428577 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 313917 (or 313907 counting only the distinct ones).

The product of its digits is 376320, while the sum is 45.

The square root of 138428577 is about 11765.5674321301. The cubic root of 138428577 is about 517.2993326867.

The spelling of 138428577 in words is "one hundred thirty-eight million, four hundred twenty-eight thousand, five hundred seventy-seven".