145681728 has 56 divisors (see below), whose sum is σ = 395886432. Its totient is φ = 47245824.

The previous prime is 145681727. The next prime is 145681763. The reversal of 145681728 is 827186541.

It is a self number, because there is not a number n which added to its sum of digits gives 145681728.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (145681727) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3150 + ... + 17357.

Almost surely, 2^145681728 is an apocalyptic number.

It is an amenable number.

145681728 is an abundant number, since it is smaller than the sum of its proper divisors (250204704).

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

145681728 is a wasteful number, since it uses less digits than its factorization.

145681728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20559 (or 20549 counting only the distinct ones).

The product of its digits is 107520, while the sum is 42.

The square root of 145681728 is about 12069.8685991190. The cubic root of 145681728 is about 526.1808377427.

The spelling of 145681728 in words is "one hundred forty-five million, six hundred eighty-one thousand, seven hundred twenty-eight".