28640480 has 48 divisors (see below), whose sum is σ = 73818864. Its totient is φ = 10414080.

The previous prime is 28640453. The next prime is 28640483. The reversal of 28640480 is 8404682.

It is a Harshad number since it is a multiple of its sum of digits (32).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28640483) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6377 + ... + 9896.

It is an arithmetic number, because the mean of its divisors is an integer number (1537893).

Almost surely, 2^28640480 is an apocalyptic number.

28640480 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28640480 is an abundant number, since it is smaller than the sum of its proper divisors (45178384).

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

28640480 is a wasteful number, since it uses less digits than its factorization.

28640480 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16299 (or 16291 counting only the distinct ones).

The product of its (nonzero) digits is 12288, while the sum is 32.

The square root of 28640480 is about 5351.6801100215. The cubic root of 28640480 is about 305.9567911422.

The spelling of 28640480 in words is "twenty-eight million, six hundred forty thousand, four hundred eighty".