28345972 has 6 divisors (see below), whose sum is σ = 49605458. Its totient is φ = 14172984.

The previous prime is 28345957. The next prime is 28345991. The reversal of 28345972 is 27954382.

It can be written as a sum of positive squares in only one way, i.e., 27836176 + 509796 = 5276^2 + 714^2 .

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3543243 + ... + 3543250.

Almost surely, 2^28345972 is an apocalyptic number.

It is an amenable number.

28345972 is a deficient number, since it is larger than the sum of its proper divisors (21259486).

28345972 is a wasteful number, since it uses less digits than its factorization.

28345972 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7086497 (or 7086495 counting only the distinct ones).

The product of its digits is 120960, while the sum is 40.

The square root of 28345972 is about 5324.0935378710. The cubic root of 28345972 is about 304.9044652863.

The spelling of 28345972 in words is "twenty-eight million, three hundred forty-five thousand, nine hundred seventy-two".