28756774 has 4 divisors (see below), whose sum is σ = 43135164. Its totient is φ = 14378386.

The previous prime is 28756771. The next prime is 28756781. The reversal of 28756774 is 47765782.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 47765782 = 2 ⋅23882891.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28756771) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7189192 + ... + 7189195.

It is an arithmetic number, because the mean of its divisors is an integer number (10783791).

Almost surely, 2^28756774 is an apocalyptic number.

28756774 is a deficient number, since it is larger than the sum of its proper divisors (14378390).

28756774 is a wasteful number, since it uses less digits than its factorization.

28756774 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14378389.

The product of its digits is 658560, while the sum is 46.

The square root of 28756774 is about 5362.5342889347. The cubic root of 28756774 is about 306.3703420427.

The spelling of 28756774 in words is "twenty-eight million, seven hundred fifty-six thousand, seven hundred seventy-four".