28746438 has 24 divisors (see below), whose sum is σ = 66880152. Its totient is φ = 8213184.

The previous prime is 28746427. The next prime is 28746463. The reversal of 28746438 is 83464782.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a self number, because there is not a number n which added to its sum of digits gives 28746438.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 48595 + ... + 49182.

It is an arithmetic number, because the mean of its divisors is an integer number (2786673).

Almost surely, 2^28746438 is an apocalyptic number.

28746438 is an abundant number, since it is smaller than the sum of its proper divisors (38133714).

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

28746438 is a wasteful number, since it uses less digits than its factorization.

28746438 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 97796 (or 97789 counting only the distinct ones).

The product of its digits is 258048, while the sum is 42.

The square root of 28746438 is about 5361.5704788802. The cubic root of 28746438 is about 306.3336315814. Note that the first 3 decimals are identical.

The spelling of 28746438 in words is "twenty-eight million, seven hundred forty-six thousand, four hundred thirty-eight".