153138728 has 8 divisors (see below), whose sum is σ = 287135130. Its totient is φ = 76569360.

The previous prime is 153138719. The next prime is 153138793. The reversal of 153138728 is 827831351.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 130462084 + 22676644 = 11422^2 + 4762^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a junction number, because it is equal to n+sod(n) for n = 153138691 and 153138700.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9571163 + ... + 9571178.

Almost surely, 2^153138728 is an apocalyptic number.

It is an amenable number.

153138728 is a deficient number, since it is larger than the sum of its proper divisors (133996402).

153138728 is a wasteful number, since it uses less digits than its factorization.

153138728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19142347 (or 19142343 counting only the distinct ones).

The product of its digits is 40320, while the sum is 38.

The square root of 153138728 is about 12374.9233532980. The cubic root of 153138728 is about 535.0097276014.

The spelling of 153138728 in words is "one hundred fifty-three million, one hundred thirty-eight thousand, seven hundred twenty-eight".