28751897 has 4 divisors (see below), whose sum is σ = 28765056. Its totient is φ = 28738740.

The previous prime is 28751893. The next prime is 28751903. The reversal of 28751897 is 79815782.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 28751897 - 2² = 28751893 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28751893) 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 3 ways as a sum of consecutive naturals, for example, 2429 + ... + 7962.

It is an arithmetic number, because the mean of its divisors is an integer number (7191264).

Almost surely, 2^28751897 is an apocalyptic number.

It is an amenable number.

28751897 is a deficient number, since it is larger than the sum of its proper divisors (13159).

28751897 is a wasteful number, since it uses less digits than its factorization.

28751897 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13158.

The product of its digits is 282240, while the sum is 47.

The square root of 28751897 is about 5362.0795406260. The cubic root of 28751897 is about 306.3530214556.

It can be divided in two parts, 287518 and 97, that multiplied together give a triangular number (27889246 = T₇₄₆₈).

The spelling of 28751897 in words is "twenty-eight million, seven hundred fifty-one thousand, eight hundred ninety-seven".