28705619 has 2 divisors, whose sum is σ = 28705620. Its totient is φ = 28705618.

The previous prime is 28705613. The next prime is 28705627. The reversal of 28705619 is 91650782.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 28705619 - 2⁴ = 28705603 is a prime.

It is a super-2 number, since 2×28705619² = 1648025124346322, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (28705613) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14352809 + 14352810.

It is an arithmetic number, because the mean of its divisors is an integer number (14352810).

Almost surely, 2^28705619 is an apocalyptic number.

28705619 is a deficient number, since it is larger than the sum of its proper divisors (1).

28705619 is an equidigital number, since it uses as much as digits as its factorization.

28705619 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 30240, while the sum is 38.

The square root of 28705619 is about 5357.7624994022. The cubic root of 28705619 is about 306.1885683250.

The spelling of 28705619 in words is "twenty-eight million, seven hundred five thousand, six hundred nineteen".