28624039 has 4 divisors (see below), whose sum is σ = 30307824. Its totient is φ = 26940256.

The previous prime is 28624033. The next prime is 28624087. The reversal of 28624039 is 93042682.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 28624039 - 2³ = 28624031 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 28623995 and 28624013.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28624031) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 841867 + ... + 841900.

It is an arithmetic number, because the mean of its divisors is an integer number (7576956).

Almost surely, 2^28624039 is an apocalyptic number.

28624039 is a deficient number, since it is larger than the sum of its proper divisors (1683785).

28624039 is a wasteful number, since it uses less digits than its factorization.

28624039 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1683784.

The product of its (nonzero) digits is 20736, while the sum is 34.

The square root of 28624039 is about 5350.1438298423. The cubic root of 28624039 is about 305.8982353447.

The spelling of 28624039 in words is "twenty-eight million, six hundred twenty-four thousand, thirty-nine".