28715487 has 8 divisors (see below), whose sum is σ = 38459904. Its totient is φ = 19057368.

The previous prime is 28715471. The next prime is 28715503. The reversal of 28715487 is 78451782.

It is an interprime number because it is at equal distance from previous prime (28715471) and next prime (28715503).

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

It is not a de Polignac number, because 28715487 - 2⁴ = 28715471 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28715417) 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, 20793 + ... + 22130.

It is an arithmetic number, because the mean of its divisors is an integer number (4807488).

Almost surely, 2^28715487 is an apocalyptic number.

28715487 is a deficient number, since it is larger than the sum of its proper divisors (9744417).

28715487 is a wasteful number, since it uses less digits than its factorization.

28715487 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43149.

The product of its digits is 125440, while the sum is 42.

The square root of 28715487 is about 5358.6833270870. The cubic root of 28715487 is about 306.2236499889.

The spelling of 28715487 in words is "twenty-eight million, seven hundred fifteen thousand, four hundred eighty-seven".