28420999 has 2 divisors, whose sum is σ = 28421000. Its totient is φ = 28420998.

The previous prime is 28420967. The next prime is 28421011. The reversal of 28420999 is 99902482.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 28420999 - 2⁵ = 28420967 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28420919) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14210499 + 14210500.

It is an arithmetic number, because the mean of its divisors is an integer number (14210500).

Almost surely, 2^28420999 is an apocalyptic number.

28420999 is a deficient number, since it is larger than the sum of its proper divisors (1).

28420999 is an equidigital number, since it uses as much as digits as its factorization.

28420999 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 93312, while the sum is 43.

The square root of 28420999 is about 5331.1348698002. The cubic root of 28420999 is about 305.1732384994.

The spelling of 28420999 in words is "twenty-eight million, four hundred twenty thousand, nine hundred ninety-nine".