28739475 has 24 divisors (see below), whose sum is σ = 52796720. Its totient is φ = 15327360.

The previous prime is 28739471. The next prime is 28739507. The reversal of 28739475 is 57493782.

It is not a de Polignac number, because 28739475 - 2² = 28739471 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 28739475.

It is not an unprimeable number, because it can be changed into a prime (28739471) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 20614 + ... + 21963.

Almost surely, 2^28739475 is an apocalyptic number.

28739475 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

28739475 is a deficient number, since it is larger than the sum of its proper divisors (24057245).

28739475 is a wasteful number, since it uses less digits than its factorization.

28739475 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42596 (or 42585 counting only the distinct ones).

The product of its digits is 423360, while the sum is 45.

The square root of 28739475 is about 5360.9210962296. The cubic root of 28739475 is about 306.3088960724.

The spelling of 28739475 in words is "twenty-eight million, seven hundred thirty-nine thousand, four hundred seventy-five".