28294330 has 16 divisors (see below), whose sum is σ = 51333120. Its totient is φ = 11228112.

The previous prime is 28294327. The next prime is 28294337. The reversal of 28294330 is 3349282.

It is a super-2 number, since 2×28294330² = 1601138220297800, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 28294292 and 28294301.

It is not an unprimeable number, because it can be changed into a prime (28294337) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9870 + ... + 12409.

It is an arithmetic number, because the mean of its divisors is an integer number (3208320).

Almost surely, 2^28294330 is an apocalyptic number.

28294330 is a deficient number, since it is larger than the sum of its proper divisors (23038790).

28294330 is a wasteful number, since it uses less digits than its factorization.

28294330 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22413.

The product of its (nonzero) digits is 10368, while the sum is 31.

The square root of 28294330 is about 5319.2414872799. The cubic root of 28294330 is about 304.7191897173.

The spelling of 28294330 in words is "twenty-eight million, two hundred ninety-four thousand, three hundred thirty".