28977480 has 128 divisors (see below), whose sum is σ = 110419200. Its totient is φ = 6621696.

The previous prime is 28977479. The next prime is 28977491. The reversal of 28977480 is 8477982.

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

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 5644 + ... + 9476.

It is an arithmetic number, because the mean of its divisors is an integer number (862650).

Almost surely, 2^28977480 is an apocalyptic number.

28977480 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28977480, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (55209600).

28977480 is an abundant number, since it is smaller than the sum of its proper divisors (81441720).

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

28977480 is a wasteful number, since it uses less digits than its factorization.

28977480 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3860 (or 3850 counting only the distinct ones).

The product of its (nonzero) digits is 225792, while the sum is 45.

The square root of 28977480 is about 5383.0734715402. The cubic root of 28977480 is about 307.1521348765.

The spelling of 28977480 in words is "twenty-eight million, nine hundred seventy-seven thousand, four hundred eighty".