28551371 has 4 divisors (see below), whose sum is σ = 28804152. Its totient is φ = 28298592.

The previous prime is 28551353. The next prime is 28551377. The reversal of 28551371 is 17315582.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28551371 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28551377) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 126221 + ... + 126446.

It is an arithmetic number, because the mean of its divisors is an integer number (7201038).

Almost surely, 2^28551371 is an apocalyptic number.

28551371 is a deficient number, since it is larger than the sum of its proper divisors (252781).

28551371 is a wasteful number, since it uses less digits than its factorization.

28551371 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 252780.

The product of its digits is 8400, while the sum is 32.

The square root of 28551371 is about 5343.3482948429. The cubic root of 28551371 is about 305.6391541517.

The spelling of 28551371 in words is "twenty-eight million, five hundred fifty-one thousand, three hundred seventy-one".