28761947 has 2 divisors, whose sum is σ = 28761948. Its totient is φ = 28761946.

The previous prime is 28761919. The next prime is 28761949. The reversal of 28761947 is 74916782.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 28761947 - 2²² = 24567643 is a prime.

Together with 28761949, 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 = 28761898 and 28761907.

It is not a weakly prime, because it can be changed into another prime (28761949) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14380973 + 14380974.

It is an arithmetic number, because the mean of its divisors is an integer number (14380974).

Almost surely, 2^28761947 is an apocalyptic number.

28761947 is a deficient number, since it is larger than the sum of its proper divisors (1).

28761947 is an equidigital number, since it uses as much as digits as its factorization.

28761947 is an evil number, because the sum of its binary digits is even.

The product of its digits is 169344, while the sum is 44.

The square root of 28761947 is about 5363.0165951636. The cubic root of 28761947 is about 306.3887117291.

The spelling of 28761947 in words is "twenty-eight million, seven hundred sixty-one thousand, nine hundred forty-seven".