157728481 has 9 divisors (see below), whose sum is σ = 166719123. Its totient is φ = 149200920.

The previous prime is 157728479. The next prime is 157728491. The reversal of 157728481 is 184827751.

The square root of 157728481 is 12559.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 125238481 + 32490000 = 11191^2 + 5700^2 .

It is not a de Polignac number, because 157728481 - 2¹ = 157728479 is a prime.

It is a super-2 number, since 2×157728481² = 49756547437134722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (157728421) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 238291 + ... + 238951.

It is an arithmetic number, because the mean of its divisors is an integer number (18524347).

Almost surely, 2^157728481 is an apocalyptic number.

157728481 is the 12559-th square number.

157728481 is the 6280-th centered octagonal number.

It is an amenable number.

157728481 is a deficient number, since it is larger than the sum of its proper divisors (8990642).

157728481 is an frugal number, since it uses more digits than its factorization.

157728481 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1360 (or 680 counting only the distinct ones).

The product of its digits is 125440, while the sum is 43.

The cubic root of 157728481 is about 540.3021639934.

The spelling of 157728481 in words is "one hundred fifty-seven million, seven hundred twenty-eight thousand, four hundred eighty-one".