28726331 has 2 divisors, whose sum is σ = 28726332. Its totient is φ = 28726330.

The previous prime is 28726307. The next prime is 28726339. The reversal of 28726331 is 13362782.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 28726331 - 2⁶ = 28726267 is a prime.

It is a super-2 number, since 2×28726331² = 1650404185443122, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (28726339) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14363165 + 14363166.

It is an arithmetic number, because the mean of its divisors is an integer number (14363166).

Almost surely, 2^28726331 is an apocalyptic number.

28726331 is a deficient number, since it is larger than the sum of its proper divisors (1).

28726331 is an equidigital number, since it uses as much as digits as its factorization.

28726331 is an evil number, because the sum of its binary digits is even.

The product of its digits is 12096, while the sum is 32.

The square root of 28726331 is about 5359.6950472951. The cubic root of 28726331 is about 306.2621921566.

The spelling of 28726331 in words is "twenty-eight million, seven hundred twenty-six thousand, three hundred thirty-one".