28742107 has 8 divisors (see below), whose sum is σ = 29529360. Its totient is φ = 27959040.

The previous prime is 28742099. The next prime is 28742113. The reversal of 28742107 is 70124782.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 28742107 - 2³ = 28742099 is a prime.

It is a super-2 number, since 2×28742107² = 1652217429598898, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28742137) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16944 + ... + 18562.

It is an arithmetic number, because the mean of its divisors is an integer number (3691170).

Almost surely, 2^28742107 is an apocalyptic number.

28742107 is a deficient number, since it is larger than the sum of its proper divisors (787253).

28742107 is a wasteful number, since it uses less digits than its factorization.

28742107 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2093.

The product of its (nonzero) digits is 6272, while the sum is 31.

The square root of 28742107 is about 5361.1665708127. The cubic root of 28742107 is about 306.3182465147.

Adding to 28742107 its reverse (70124782), we get a palindrome (98866889).

The spelling of 28742107 in words is "twenty-eight million, seven hundred forty-two thousand, one hundred seven".