155730728 has 8 divisors (see below), whose sum is σ = 291995130. Its totient is φ = 77865360.

The previous prime is 155730719. The next prime is 155730737. The reversal of 155730728 is 827037551.

It is a happy number.

155730728 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (155730719) and next prime (155730737).

It can be written as a sum of positive squares in only one way, i.e., 144048004 + 11682724 = 12002^2 + 3418^2 .

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 = 155730691 and 155730700.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9733163 + ... + 9733178.

Almost surely, 2^155730728 is an apocalyptic number.

It is an amenable number.

155730728 is a deficient number, since it is larger than the sum of its proper divisors (136264402).

155730728 is a wasteful number, since it uses less digits than its factorization.

155730728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19466347 (or 19466343 counting only the distinct ones).

The product of its (nonzero) digits is 58800, while the sum is 38.

The square root of 155730728 is about 12479.2118340863. The cubic root of 155730728 is about 538.0113502578.

The spelling of 155730728 in words is "one hundred fifty-five million, seven hundred thirty thousand, seven hundred twenty-eight".