28742210 has 32 divisors (see below), whose sum is σ = 59685120. Its totient is φ = 9761472.

The previous prime is 28742201. The next prime is 28742213. The reversal of 28742210 is 1224782.

It is a super-2 number, since 2×28742210² = 1652229271368200, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 28742210.

It is not an unprimeable number, because it can be changed into a prime (28742213) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5747 + ... + 9513.

It is an arithmetic number, because the mean of its divisors is an integer number (1865160).

Almost surely, 2^28742210 is an apocalyptic number.

28742210 is an abundant number, since it is smaller than the sum of its proper divisors (30942910).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

28742210 is a wasteful number, since it uses less digits than its factorization.

28742210 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3890.

The product of its (nonzero) digits is 1792, while the sum is 26.

The square root of 28742210 is about 5361.1761769224. The cubic root of 28742210 is about 306.3186124209.

Adding to 28742210 its reverse (1224782), we get a palindrome (29966992).

The spelling of 28742210 in words is "twenty-eight million, seven hundred forty-two thousand, two hundred ten".