28457663 has 16 divisors (see below), whose sum is σ = 31428096. Its totient is φ = 25608960.

The previous prime is 28457641. The next prime is 28457669. The reversal of 28457663 is 36675482.

It is a happy number.

It is not a de Polignac number, because 28457663 - 2¹⁶ = 28392127 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 28457663.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28457669) 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, 148898 + ... + 149088.

It is an arithmetic number, because the mean of its divisors is an integer number (1964256).

Almost surely, 2^28457663 is an apocalyptic number.

28457663 is a deficient number, since it is larger than the sum of its proper divisors (2970433).

28457663 is a wasteful number, since it uses less digits than its factorization.

28457663 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 434.

The product of its digits is 241920, while the sum is 41.

The square root of 28457663 is about 5334.5724289769. The cubic root of 28457663 is about 305.3044098647.

The spelling of 28457663 in words is "twenty-eight million, four hundred fifty-seven thousand, six hundred sixty-three".