28304493 has 16 divisors (see below), whose sum is σ = 44618880. Its totient is φ = 15615936.

The previous prime is 28304489. The next prime is 28304527. The reversal of 28304493 is 39440382.

It is not a de Polignac number, because 28304493 - 2² = 28304489 is a prime.

It is a super-2 number, since 2×28304493² = 1602288647974098, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28304453) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 22630 + ... + 23847.

It is an arithmetic number, because the mean of its divisors is an integer number (2788680).

Almost surely, 2^28304493 is an apocalyptic number.

It is an amenable number.

28304493 is a deficient number, since it is larger than the sum of its proper divisors (16314387).

28304493 is a wasteful number, since it uses less digits than its factorization.

28304493 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46516.

The product of its (nonzero) digits is 20736, while the sum is 33.

The square root of 28304493 is about 5320.1967068897. The cubic root of 28304493 is about 304.7556692335.

The spelling of 28304493 in words is "twenty-eight million, three hundred four thousand, four hundred ninety-three".