28820744 has 8 divisors (see below), whose sum is σ = 54038910. Its totient is φ = 14410368.

The previous prime is 28820741. The next prime is 28820747. The reversal of 28820744 is 44702882.

It is an interprime number because it is at equal distance from previous prime (28820741) and next prime (28820747).

It can be written as a sum of positive squares in only one way, i.e., 20811844 + 8008900 = 4562^2 + 2830^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28820741) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1801289 + ... + 1801304.

Almost surely, 2^28820744 is an apocalyptic number.

It is an amenable number.

28820744 is a deficient number, since it is larger than the sum of its proper divisors (25218166).

28820744 is a wasteful number, since it uses less digits than its factorization.

28820744 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3602599 (or 3602595 counting only the distinct ones).

The product of its (nonzero) digits is 28672, while the sum is 35.

The square root of 28820744 is about 5368.4955061917. The cubic root of 28820744 is about 306.5973493824.

The spelling of 28820744 in words is "twenty-eight million, eight hundred twenty thousand, seven hundred forty-four".