28709019 has 32 divisors (see below), whose sum is σ = 45158400. Its totient is φ = 17975520.

The previous prime is 28709017. The next prime is 28709029. The reversal of 28709019 is 91090782.

It is a happy number.

It is not a de Polignac number, because 28709019 - 2¹ = 28709017 is a prime.

It is a super-2 number, since 2×28709019² = 1648415543884722, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (28709011) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 97837 + ... + 98129.

It is an arithmetic number, because the mean of its divisors is an integer number (1411200).

Almost surely, 2^28709019 is an apocalyptic number.

28709019 is a deficient number, since it is larger than the sum of its proper divisors (16449381).

28709019 is a wasteful number, since it uses less digits than its factorization.

28709019 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 512 (or 506 counting only the distinct ones).

The product of its (nonzero) digits is 9072, while the sum is 36.

The square root of 28709019 is about 5358.0797866400. The cubic root of 28709019 is about 306.2006565510.

The spelling of 28709019 in words is "twenty-eight million, seven hundred nine thousand, nineteen".