28511478 has 24 divisors (see below), whose sum is σ = 62127000. Its totient is φ = 9449664.

The previous prime is 28511477. The next prime is 28511479. The reversal of 28511478 is 87411582.

It is an interprime number because it is at equal distance from previous prime (28511477) and next prime (28511479).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28511477) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1203 + ... + 7646.

It is an arithmetic number, because the mean of its divisors is an integer number (2588625).

Almost surely, 2^28511478 is an apocalyptic number.

28511478 is an abundant number, since it is smaller than the sum of its proper divisors (33615522).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

28511478 is a wasteful number, since it uses less digits than its factorization.

28511478 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9036 (or 9033 counting only the distinct ones).

The product of its digits is 17920, while the sum is 36.

The square root of 28511478 is about 5339.6140309951. The cubic root of 28511478 is about 305.4967378038.

The spelling of 28511478 in words is "twenty-eight million, five hundred eleven thousand, four hundred seventy-eight".