28632997 has 4 divisors (see below), whose sum is σ = 28995520. Its totient is φ = 28270476.

The previous prime is 28632983. The next prime is 28633021. The reversal of 28632997 is 79923682.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28632997 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 (28632397) 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, 181143 + ... + 181300.

It is an arithmetic number, because the mean of its divisors is an integer number (7248880).

Almost surely, 2^28632997 is an apocalyptic number.

It is an amenable number.

28632997 is a deficient number, since it is larger than the sum of its proper divisors (362523).

28632997 is an equidigital number, since it uses as much as digits as its factorization.

28632997 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 362522.

The product of its digits is 326592, while the sum is 46.

The square root of 28632997 is about 5350.9809381085. The cubic root of 28632997 is about 305.9301426818.

The spelling of 28632997 in words is "twenty-eight million, six hundred thirty-two thousand, nine hundred ninety-seven".