28408007 has 2 divisors, whose sum is σ = 28408008. Its totient is φ = 28408006.

The previous prime is 28408001. The next prime is 28408031. The reversal of 28408007 is 70080482.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 28408007 - 2²² = 24213703 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28408001) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14204003 + 14204004.

It is an arithmetic number, because the mean of its divisors is an integer number (14204004).

Almost surely, 2^28408007 is an apocalyptic number.

28408007 is a deficient number, since it is larger than the sum of its proper divisors (1).

28408007 is an equidigital number, since it uses as much as digits as its factorization.

28408007 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3584, while the sum is 29.

The square root of 28408007 is about 5329.9162282347. The cubic root of 28408007 is about 305.1267304578.

Adding to 28408007 its reverse (70080482), we get a palindrome (98488489).

The spelling of 28408007 in words is "twenty-eight million, four hundred eight thousand, seven".