28458405 has 16 divisors (see below), whose sum is σ = 50592960. Its totient is φ = 15177744.

The previous prime is 28458401. The next prime is 28458413. The reversal of 28458405 is 50485482.

It is not a de Polignac number, because 28458405 - 2² = 28458401 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 28458405.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28458401) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 105267 + ... + 105536.

It is an arithmetic number, because the mean of its divisors is an integer number (3162060).

Almost surely, 2^28458405 is an apocalyptic number.

It is an amenable number.

28458405 is a deficient number, since it is larger than the sum of its proper divisors (22134555).

28458405 is a wasteful number, since it uses less digits than its factorization.

28458405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 210817 (or 210811 counting only the distinct ones).

The product of its (nonzero) digits is 51200, while the sum is 36.

The square root of 28458405 is about 5334.6419748658. The cubic root of 28458405 is about 305.3070633257.

The spelling of 28458405 in words is "twenty-eight million, four hundred fifty-eight thousand, four hundred five".