28304371 has 12 divisors (see below), whose sum is σ = 30891568. Its totient is φ = 25909632.

The previous prime is 28304347. The next prime is 28304399. The reversal of 28304371 is 17340382.

It is not a de Polignac number, because 28304371 - 2¹³ = 28296179 is a prime.

It is a super-2 number, since 2×28304371² = 1602274835411282, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28304321) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 9370 + ... + 12016.

Almost surely, 2^28304371 is an apocalyptic number.

28304371 is a deficient number, since it is larger than the sum of its proper divisors (2587197).

28304371 is a wasteful number, since it uses less digits than its factorization.

28304371 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2718 (or 2701 counting only the distinct ones).

The product of its (nonzero) digits is 4032, while the sum is 28.

The square root of 28304371 is about 5320.1852411359. The cubic root of 28304371 is about 304.7552313732.

The spelling of 28304371 in words is "twenty-eight million, three hundred four thousand, three hundred seventy-one".