28742751 has 6 divisors (see below), whose sum is σ = 41517320. Its totient is φ = 19161828.

The previous prime is 28742731. The next prime is 28742759. The reversal of 28742751 is 15724782.

It is not a de Polignac number, because 28742751 - 2⁵ = 28742719 is a prime.

It is a super-2 number, since 2×28742751² = 1652291470096002, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28742759) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1596811 + ... + 1596828.

Almost surely, 2^28742751 is an apocalyptic number.

28742751 is a deficient number, since it is larger than the sum of its proper divisors (12774569).

28742751 is a wasteful number, since it uses less digits than its factorization.

28742751 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3193645 (or 3193642 counting only the distinct ones).

The product of its digits is 31360, while the sum is 36.

The square root of 28742751 is about 5361.2266320311. The cubic root of 28742751 is about 306.3205343020.

It can be divided in two parts, 2874 and 2751, that added together give a square (5625 = 75²).

The spelling of 28742751 in words is "twenty-eight million, seven hundred forty-two thousand, seven hundred fifty-one".