28743438 has 8 divisors (see below), whose sum is σ = 57486888. Its totient is φ = 9581144.

The previous prime is 28743401. The next prime is 28743467. The reversal of 28743438 is 83434782.

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

28743438 is an admirable number.

It is a junction number, because it is equal to n+sod(n) for n = 28743396 and 28743405.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2395281 + ... + 2395292.

It is an arithmetic number, because the mean of its divisors is an integer number (7185861).

Almost surely, 2^28743438 is an apocalyptic number.

28743438 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

28743438 is a wasteful number, since it uses less digits than its factorization.

28743438 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4790578.

The product of its digits is 129024, while the sum is 39.

The square root of 28743438 is about 5361.2907028066. The cubic root of 28743438 is about 306.3229748075.

The spelling of 28743438 in words is "twenty-eight million, seven hundred forty-three thousand, four hundred thirty-eight".