28724701 has 2 divisors, whose sum is σ = 28724702. Its totient is φ = 28724700.

The previous prime is 28724699. The next prime is 28724711. The reversal of 28724701 is 10742782.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 28100601 + 624100 = 5301^2 + 790^2 .

It is a cyclic number.

It is not a de Polignac number, because 28724701 - 2¹ = 28724699 is a prime.

Together with 28724699, it forms a pair of twin primes.

It is a nialpdrome in base 12.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28724711) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14362350 + 14362351.

It is an arithmetic number, because the mean of its divisors is an integer number (14362351).

Almost surely, 2^28724701 is an apocalyptic number.

It is an amenable number.

28724701 is a deficient number, since it is larger than the sum of its proper divisors (1).

28724701 is an equidigital number, since it uses as much as digits as its factorization.

28724701 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6272, while the sum is 31.

The square root of 28724701 is about 5359.5429842478. The cubic root of 28724701 is about 306.2563993665.

The spelling of 28724701 in words is "twenty-eight million, seven hundred twenty-four thousand, seven hundred one".