28632521 has 2 divisors, whose sum is σ = 28632522. Its totient is φ = 28632520.

The previous prime is 28632509. The next prime is 28632529. The reversal of 28632521 is 12523682.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17106496 + 11526025 = 4136^2 + 3395^2 .

It is a cyclic number.

It is not a de Polignac number, because 28632521 - 2²² = 24438217 is a prime.

It is not a weakly prime, because it can be changed into another prime (28632529) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14316260 + 14316261.

It is an arithmetic number, because the mean of its divisors is an integer number (14316261).

Almost surely, 2^28632521 is an apocalyptic number.

It is an amenable number.

28632521 is a deficient number, since it is larger than the sum of its proper divisors (1).

28632521 is an equidigital number, since it uses as much as digits as its factorization.

28632521 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5760, while the sum is 29.

The square root of 28632521 is about 5350.9364600974. The cubic root of 28632521 is about 305.9284473935.

The spelling of 28632521 in words is "twenty-eight million, six hundred thirty-two thousand, five hundred twenty-one".