28739924 has 6 divisors (see below), whose sum is σ = 50294874. Its totient is φ = 14369960.

The previous prime is 28739917. The next prime is 28739929. The reversal of 28739924 is 42993782.

It can be written as a sum of positive squares in only one way, i.e., 26337424 + 2402500 = 5132^2 + 1550^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28739929) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3592487 + ... + 3592494.

It is an arithmetic number, because the mean of its divisors is an integer number (8382479).

Almost surely, 2^28739924 is an apocalyptic number.

It is an amenable number.

28739924 is a deficient number, since it is larger than the sum of its proper divisors (21554950).

28739924 is a wasteful number, since it uses less digits than its factorization.

28739924 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7184985 (or 7184983 counting only the distinct ones).

The product of its digits is 217728, while the sum is 44.

The square root of 28739924 is about 5360.9629731980. The cubic root of 28739924 is about 306.3104912301.

The spelling of 28739924 in words is "twenty-eight million, seven hundred thirty-nine thousand, nine hundred twenty-four".