28702639 has 8 divisors (see below), whose sum is σ = 33689888. Its totient is φ = 23937120.

The previous prime is 28702607. The next prime is 28702649. The reversal of 28702639 is 93620782.

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

It is a cyclic number.

It is not a de Polignac number, because 28702639 - 2⁵ = 28702607 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (37).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 28702598 and 28702607.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28702649) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 55152 + ... + 55669.

It is an arithmetic number, because the mean of its divisors is an integer number (4211236).

Almost surely, 2^28702639 is an apocalyptic number.

28702639 is a deficient number, since it is larger than the sum of its proper divisors (4987249).

28702639 is a wasteful number, since it uses less digits than its factorization.

28702639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 110865.

The product of its (nonzero) digits is 36288, while the sum is 37.

The square root of 28702639 is about 5357.4843910179. The cubic root of 28702639 is about 306.1779725655.

The spelling of 28702639 in words is "twenty-eight million, seven hundred two thousand, six hundred thirty-nine".