28988471 has 4 divisors (see below), whose sum is σ = 30514200. Its totient is φ = 27462744.

The previous prime is 28988461. The next prime is 28988473. The reversal of 28988471 is 17488982.

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

It is a cyclic number.

It is not a de Polignac number, because 28988471 - 2¹⁴ = 28972087 is a prime.

It is a super-3 number, since 3×28988471³ (a number of 23 digits) contains 333 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 (28988473) 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, 762836 + ... + 762873.

It is an arithmetic number, because the mean of its divisors is an integer number (7628550).

Almost surely, 2^28988471 is an apocalyptic number.

28988471 is a deficient number, since it is larger than the sum of its proper divisors (1525729).

28988471 is a wasteful number, since it uses less digits than its factorization.

28988471 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1525728.

The product of its digits is 258048, while the sum is 47.

The square root of 28988471 is about 5384.0942599475. The cubic root of 28988471 is about 307.1909636771.

The spelling of 28988471 in words is "twenty-eight million, nine hundred eighty-eight thousand, four hundred seventy-one".