28918647 has 8 divisors (see below), whose sum is σ = 42842480. Its totient is φ = 19279080.

The previous prime is 28918639. The next prime is 28918651. The reversal of 28918647 is 74681982.

It is not a de Polignac number, because 28918647 - 2³ = 28918639 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28914647) 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, 535504 + ... + 535557.

It is an arithmetic number, because the mean of its divisors is an integer number (5355310).

Almost surely, 2^28918647 is an apocalyptic number.

28918647 is a gapful number since it is divisible by the number (27) formed by its first and last digit.

28918647 is a deficient number, since it is larger than the sum of its proper divisors (13923833).

28918647 is a wasteful number, since it uses less digits than its factorization.

28918647 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1071070 (or 1071064 counting only the distinct ones).

The product of its digits is 193536, while the sum is 45.

The square root of 28918647 is about 5377.6060658996. The cubic root of 28918647 is about 306.9441236323.

The spelling of 28918647 in words is "twenty-eight million, nine hundred eighteen thousand, six hundred forty-seven".