128275537 has 4 divisors (see below), whose sum is σ = 138142900. Its totient is φ = 118408176.

The previous prime is 128275519. The next prime is 128275547. The reversal of 128275537 is 735572821.

It is a happy number.

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 31371201 + 96904336 = 5601^2 + 9844^2 .

It is a cyclic number.

It is not a de Polignac number, because 128275537 - 2¹⁵ = 128242769 is a prime.

It is a super-2 number, since 2×128275537² = 32909226785276738, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 128275537.

It is not an unprimeable number, because it can be changed into a prime (128275507) 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 3 ways as a sum of consecutive naturals, for example, 4933662 + ... + 4933687.

It is an arithmetic number, because the mean of its divisors is an integer number (34535725).

Almost surely, 2^128275537 is an apocalyptic number.

It is an amenable number.

128275537 is a deficient number, since it is larger than the sum of its proper divisors (9867363).

128275537 is an equidigital number, since it uses as much as digits as its factorization.

128275537 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9867362.

The product of its digits is 117600, while the sum is 40.

The square root of 128275537 is about 11325.8790828792. The cubic root of 128275537 is about 504.3297804421.

The spelling of 128275537 in words is "one hundred twenty-eight million, two hundred seventy-five thousand, five hundred thirty-seven".