28742755 has 16 divisors (see below), whose sum is σ = 36336960. Its totient is φ = 21783168.

The previous prime is 28742731. The next prime is 28742759. The reversal of 28742755 is 55724782.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 28742755 - 2⁵ = 28742723 is a prime.

It is a super-2 number, since 2×28742755² = 1652291929980050, which contains 22 as substring.

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

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11389 + ... + 13681.

It is an arithmetic number, because the mean of its divisors is an integer number (2271060).

Almost surely, 2^28742755 is an apocalyptic number.

28742755 is a deficient number, since it is larger than the sum of its proper divisors (7594205).

28742755 is a wasteful number, since it uses less digits than its factorization.

28742755 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2430.

The product of its digits is 156800, while the sum is 40.

The square root of 28742755 is about 5361.2270050801. The cubic root of 28742755 is about 306.3205485117.

The spelling of 28742755 in words is "twenty-eight million, seven hundred forty-two thousand, seven hundred fifty-five".