150728621 has 4 divisors (see below), whose sum is σ = 153199644. Its totient is φ = 148257600.

The previous prime is 150728569. The next prime is 150728623. The reversal of 150728621 is 126827051.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 60668521 + 90060100 = 7789^2 + 9490^2 .

It is a cyclic number.

It is not a de Polignac number, because 150728621 - 2¹⁰ = 150727597 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (150728623) 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, 1235420 + ... + 1235541.

It is an arithmetic number, because the mean of its divisors is an integer number (38299911).

Almost surely, 2^150728621 is an apocalyptic number.

It is an amenable number.

150728621 is a deficient number, since it is larger than the sum of its proper divisors (2471023).

150728621 is an equidigital number, since it uses as much as digits as its factorization.

150728621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2471022.

The product of its (nonzero) digits is 6720, while the sum is 32.

The square root of 150728621 is about 12277.1585067555. The cubic root of 150728621 is about 532.1882013109.

The spelling of 150728621 in words is "one hundred fifty million, seven hundred twenty-eight thousand, six hundred twenty-one".