28993673 has 8 divisors (see below), whose sum is σ = 29373960. Its totient is φ = 28615680.

The previous prime is 28993637. The next prime is 28993693. The reversal of 28993673 is 37639982.

It can be written as a sum of positive squares in 4 ways, for example, as 13564489 + 15429184 = 3683^2 + 3928^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 28993673 - 2¹² = 28989577 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28993693) 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, 49961 + ... + 50537.

It is an arithmetic number, because the mean of its divisors is an integer number (3671745).

Almost surely, 2^28993673 is an apocalyptic number.

It is an amenable number.

28993673 is a deficient number, since it is larger than the sum of its proper divisors (380287).

28993673 is a wasteful number, since it uses less digits than its factorization.

28993673 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1147.

The product of its digits is 489888, while the sum is 47.

The square root of 28993673 is about 5384.5773278875. The cubic root of 28993673 is about 307.2093377842.

The spelling of 28993673 in words is "twenty-eight million, nine hundred ninety-three thousand, six hundred seventy-three".