28749687 has 8 divisors (see below), whose sum is σ = 38469504. Its totient is φ = 19098168.

The previous prime is 28749649. The next prime is 28749689. The reversal of 28749687 is 78694782.

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

It is not a de Polignac number, because 28749687 - 2¹⁴ = 28733303 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28749689) 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, 16083 + ... + 17780.

It is an arithmetic number, because the mean of its divisors is an integer number (4808688).

Almost surely, 2^28749687 is an apocalyptic number.

28749687 is a deficient number, since it is larger than the sum of its proper divisors (9719817).

28749687 is a wasteful number, since it uses less digits than its factorization.

28749687 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34149.

The product of its digits is 1354752, while the sum is 51.

The square root of 28749687 is about 5361.8734599019. The cubic root of 28749687 is about 306.3451720312.

It can be divided in two parts, 2874 and 9687, that added together give a triangular number (12561 = T₁₅₈).

The spelling of 28749687 in words is "twenty-eight million, seven hundred forty-nine thousand, six hundred eighty-seven".