28919744 has 28 divisors (see below), whose sum is σ = 65586864. Its totient is φ = 12393984.

The previous prime is 28919731. The next prime is 28919747. The reversal of 28919744 is 44791982.

It is a tau number, because it is divible by the number of its divisors (28).

It is a junction number, because it is equal to n+sod(n) for n = 28919695 and 28919704.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28919747) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 31829 + ... + 32724.

It is an arithmetic number, because the mean of its divisors is an integer number (2342388).

Almost surely, 2^28919744 is an apocalyptic number.

It is an amenable number.

28919744 is an abundant number, since it is smaller than the sum of its proper divisors (36667120).

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

28919744 is an equidigital number, since it uses as much as digits as its factorization.

28919744 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64572 (or 64562 counting only the distinct ones).

The product of its digits is 145152, while the sum is 44.

The square root of 28919744 is about 5377.7080619907. The cubic root of 28919744 is about 306.9480047895.

The spelling of 28919744 in words is "twenty-eight million, nine hundred nineteen thousand, seven hundred forty-four".