28761447 has 16 divisors (see below), whose sum is σ = 45053568. Its totient is φ = 16090080.

The previous prime is 28761437. The next prime is 28761449. The reversal of 28761447 is 74416782.

It is not a de Polignac number, because 28761447 - 2⁸ = 28761191 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28761449) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 33093 + ... + 33950.

It is an arithmetic number, because the mean of its divisors is an integer number (2815848).

Almost surely, 2^28761447 is an apocalyptic number.

28761447 is a deficient number, since it is larger than the sum of its proper divisors (16292121).

28761447 is a wasteful number, since it uses less digits than its factorization.

28761447 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 67070.

The product of its digits is 75264, while the sum is 39.

The square root of 28761447 is about 5362.9699794051. The cubic root of 28761447 is about 306.3869362901.

It can be divided in two parts, 287614 and 47, that added together give a triangular number (287661 = T₇₅₈).

The spelling of 28761447 in words is "twenty-eight million, seven hundred sixty-one thousand, four hundred forty-seven".