28272357 has 6 divisors (see below), whose sum is σ = 40837862. Its totient is φ = 18848232.

The previous prime is 28272353. The next prime is 28272383. The reversal of 28272357 is 75327282.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 24147396 + 4124961 = 4914^2 + 2031^2 .

It is not a de Polignac number, because 28272357 - 2² = 28272353 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28272353) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1570678 + ... + 1570695.

Almost surely, 2^28272357 is an apocalyptic number.

It is an amenable number.

28272357 is a deficient number, since it is larger than the sum of its proper divisors (12565505).

28272357 is a wasteful number, since it uses less digits than its factorization.

28272357 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3141379 (or 3141376 counting only the distinct ones).

The product of its digits is 47040, while the sum is 36.

The square root of 28272357 is about 5317.1756600662. The cubic root of 28272357 is about 304.6402890007.

It can be divided in two parts, 2827 and 2357, that added together give a square (5184 = 72²).

The spelling of 28272357 in words is "twenty-eight million, two hundred seventy-two thousand, three hundred fifty-seven".