28725737 has 2 divisors, whose sum is σ = 28725738. Its totient is φ = 28725736.

The previous prime is 28725721. The next prime is 28725761. The reversal of 28725737 is 73752782.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 24641296 + 4084441 = 4964^2 + 2021^2 .

It is a cyclic number.

It is not a de Polignac number, because 28725737 - 2⁴ = 28725721 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 28725694 and 28725703.

It is not a weakly prime, because it can be changed into another prime (28724737) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14362868 + 14362869.

It is an arithmetic number, because the mean of its divisors is an integer number (14362869).

Almost surely, 2^28725737 is an apocalyptic number.

It is an amenable number.

28725737 is a deficient number, since it is larger than the sum of its proper divisors (1).

28725737 is an equidigital number, since it uses as much as digits as its factorization.

28725737 is an evil number, because the sum of its binary digits is even.

The product of its digits is 164640, while the sum is 41.

The square root of 28725737 is about 5359.6396334082. The cubic root of 28725737 is about 306.2600811897.

The spelling of 28725737 in words is "twenty-eight million, seven hundred twenty-five thousand, seven hundred thirty-seven".