28051623 has 16 divisors (see below), whose sum is σ = 41678560. Its totient is φ = 18646848.

The previous prime is 28051607. The next prime is 28051691. The reversal of 28051623 is 32615082.

It is not a de Polignac number, because 28051623 - 2⁴ = 28051607 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28051693) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9411 + ... + 12027.

It is an arithmetic number, because the mean of its divisors is an integer number (2604910).

Almost surely, 2^28051623 is an apocalyptic number.

28051623 is a deficient number, since it is larger than the sum of its proper divisors (13626937).

28051623 is a wasteful number, since it uses less digits than its factorization.

28051623 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3023 (or 3017 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 27.

The square root of 28051623 is about 5296.3782908701. The cubic root of 28051623 is about 303.8453990852.

The spelling of 28051623 in words is "twenty-eight million, fifty-one thousand, six hundred twenty-three".