28661480 has 32 divisors (see below), whose sum is σ = 64864800. Its totient is φ = 11397696.

The previous prime is 28661459. The next prime is 28661489. The reversal of 28661480 is 8416682.

It is a Smith number, since the sum of its digits (35) coincides with the sum of the digits of its prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 28661480.

It is not an unprimeable number, because it can be changed into a prime (28661489) 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, 5159 + ... + 9161.

It is an arithmetic number, because the mean of its divisors is an integer number (2027025).

Almost surely, 2^28661480 is an apocalyptic number.

28661480 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28661480 is an abundant number, since it is smaller than the sum of its proper divisors (36203320).

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

28661480 is a wasteful number, since it uses less digits than its factorization.

28661480 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4193 (or 4189 counting only the distinct ones).

The product of its (nonzero) digits is 18432, while the sum is 35.

The square root of 28661480 is about 5353.6417511821. The cubic root of 28661480 is about 306.0315515617.

The spelling of 28661480 in words is "twenty-eight million, six hundred sixty-one thousand, four hundred eighty".