28323551 has 2 divisors, whose sum is σ = 28323552. Its totient is φ = 28323550.

The previous prime is 28323539. The next prime is 28323577. The reversal of 28323551 is 15532382.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 28323551 - 2⁶ = 28323487 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28323151) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14161775 + 14161776.

It is an arithmetic number, because the mean of its divisors is an integer number (14161776).

Almost surely, 2^28323551 is an apocalyptic number.

28323551 is a deficient number, since it is larger than the sum of its proper divisors (1).

28323551 is an equidigital number, since it uses as much as digits as its factorization.

28323551 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7200, while the sum is 29.

The square root of 28323551 is about 5321.9875046828. The cubic root of 28323551 is about 304.8240533175.

The spelling of 28323551 in words is "twenty-eight million, three hundred twenty-three thousand, five hundred fifty-one".