28685407 has 2 divisors, whose sum is σ = 28685408. Its totient is φ = 28685406.

The previous prime is 28685401. The next prime is 28685411. The reversal of 28685407 is 70458682.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 28685407 - 2¹⁵ = 28652639 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 28685407.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28685401) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14342703 + 14342704.

It is an arithmetic number, because the mean of its divisors is an integer number (14342704).

Almost surely, 2^28685407 is an apocalyptic number.

28685407 is a deficient number, since it is larger than the sum of its proper divisors (1).

28685407 is an equidigital number, since it uses as much as digits as its factorization.

28685407 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 107520, while the sum is 40.

The square root of 28685407 is about 5355.8759320955. The cubic root of 28685407 is about 306.1166876661.

It can be divided in two parts, 28685 and 407, that added together give a palindrome (29092).

The spelling of 28685407 in words is "twenty-eight million, six hundred eighty-five thousand, four hundred seven".