28701731 has 2 divisors, whose sum is σ = 28701732. Its totient is φ = 28701730.

The previous prime is 28701719. The next prime is 28701733. The reversal of 28701731 is 13710782.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 28701731 - 2⁶ = 28701667 is a prime.

It is a super-2 number, since 2×28701731² = 1647578724792722, which contains 22 as substring.

Together with 28701733, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 28701694 and 28701703.

It is not a weakly prime, because it can be changed into another prime (28701733) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14350865 + 14350866.

It is an arithmetic number, because the mean of its divisors is an integer number (14350866).

Almost surely, 2^28701731 is an apocalyptic number.

28701731 is a deficient number, since it is larger than the sum of its proper divisors (1).

28701731 is an equidigital number, since it uses as much as digits as its factorization.

28701731 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2352, while the sum is 29.

The square root of 28701731 is about 5357.3996490835. The cubic root of 28701731 is about 306.1747439131.

The spelling of 28701731 in words is "twenty-eight million, seven hundred one thousand, seven hundred thirty-one".