28455639 has 8 divisors (see below), whose sum is σ = 38316912. Its totient is φ = 18782400.

The previous prime is 28455617. The next prime is 28455643. The reversal of 28455639 is 93655482.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 28455639 - 2¹¹ = 28453591 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 28455639.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28455659) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 46654 + ... + 47259.

It is an arithmetic number, because the mean of its divisors is an integer number (4789614).

Almost surely, 2^28455639 is an apocalyptic number.

28455639 is a deficient number, since it is larger than the sum of its proper divisors (9861273).

28455639 is a wasteful number, since it uses less digits than its factorization.

28455639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 94017.

The product of its digits is 259200, while the sum is 42.

The square root of 28455639 is about 5334.3827196781. The cubic root of 28455639 is about 305.2971716177.

The spelling of 28455639 in words is "twenty-eight million, four hundred fifty-five thousand, six hundred thirty-nine".