147728781 has 36 divisors (see below), whose sum is σ = 230908860. Its totient is φ = 90944640.

The previous prime is 147728773. The next prime is 147728797. The reversal of 147728781 is 187827741.

It can be written as a sum of positive squares in 2 ways, for example, as 4447881 + 143280900 = 2109^2 + 11970^2 .

It is not a de Polignac number, because 147728781 - 2³ = 147728773 is a prime.

It is a super-2 number, since 2×147728781² = 43647585471491922, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (147728731) 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 35 ways as a sum of consecutive naturals, for example, 132655 + ... + 133763.

It is an arithmetic number, because the mean of its divisors is an integer number (6414135).

Almost surely, 2^147728781 is an apocalyptic number.

It is an amenable number.

147728781 is a deficient number, since it is larger than the sum of its proper divisors (83180079).

147728781 is a wasteful number, since it uses less digits than its factorization.

147728781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1194 (or 1172 counting only the distinct ones).

The product of its digits is 175616, while the sum is 45.

The square root of 147728781 is about 12154.3729167736. The cubic root of 147728781 is about 528.6339342514.

The spelling of 147728781 in words is "one hundred forty-seven million, seven hundred twenty-eight thousand, seven hundred eighty-one".