28019417 has 6 divisors (see below), whose sum is σ = 29764878. Its totient is φ = 26370944.

The previous prime is 28019413. The next prime is 28019419. The reversal of 28019417 is 71491082.

It can be written as a sum of positive squares in 3 ways, for example, as 17547721 + 10471696 = 4189^2 + 3236^2 .

It is not a de Polignac number, because 28019417 - 2² = 28019413 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28019413) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 48188 + ... + 48765.

It is an arithmetic number, because the mean of its divisors is an integer number (4960813).

Almost surely, 2^28019417 is an apocalyptic number.

It is an amenable number.

28019417 is a deficient number, since it is larger than the sum of its proper divisors (1745461).

28019417 is an equidigital number, since it uses as much as digits as its factorization.

28019417 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 96987 (or 96970 counting only the distinct ones).

The product of its (nonzero) digits is 4032, while the sum is 32.

The square root of 28019417 is about 5293.3370382019. The cubic root of 28019417 is about 303.7290731686.

The spelling of 28019417 in words is "twenty-eight million, nineteen thousand, four hundred seventeen".