32128993 has 4 divisors (see below), whose sum is σ = 34600468. Its totient is φ = 29657520.

The previous prime is 32128973. The next prime is 32129011. The reversal of 32128993 is 39982123.

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 20684304 + 11444689 = 4548^2 + 3383^2 .

It is a cyclic number.

It is not a de Polignac number, because 32128993 - 2¹³ = 32120801 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (32128973) 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, 1235718 + ... + 1235743.

It is an arithmetic number, because the mean of its divisors is an integer number (8650117).

Almost surely, 2^32128993 is an apocalyptic number.

It is an amenable number.

32128993 is a deficient number, since it is larger than the sum of its proper divisors (2471475).

32128993 is a wasteful number, since it uses less digits than its factorization.

32128993 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2471474.

The product of its digits is 23328, while the sum is 37.

The square root of 32128993 is about 5668.2442607919. The cubic root of 32128993 is about 317.9062293566.

The spelling of 32128993 in words is "thirty-two million, one hundred twenty-eight thousand, nine hundred ninety-three".