28722472 has 8 divisors (see below), whose sum is σ = 53854650. Its totient is φ = 14361232.

The previous prime is 28722443. The next prime is 28722479. The reversal of 28722472 is 27422782.

It can be written as a sum of positive squares in only one way, i.e., 23677956 + 5044516 = 4866^2 + 2246^2 .

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

It is not an unprimeable number, because it can be changed into a prime (28722479) by changing a digit.

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, 1795147 + ... + 1795162.

Almost surely, 2^28722472 is an apocalyptic number.

It is an amenable number.

28722472 is a deficient number, since it is larger than the sum of its proper divisors (25132178).

28722472 is a wasteful number, since it uses less digits than its factorization.

28722472 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3590315 (or 3590311 counting only the distinct ones).

The product of its digits is 25088, while the sum is 34.

The square root of 28722472 is about 5359.3350333787. The cubic root of 28722472 is about 306.2484774602.

It can be divided in two parts, 287224 and 72, that added together give a square (287296 = 536²).

The spelling of 28722472 in words is "twenty-eight million, seven hundred twenty-two thousand, four hundred seventy-two".