28772480 has 128 divisors (see below), whose sum is σ = 77405760. Its totient is φ = 10137600.

The previous prime is 28772467. The next prime is 28772489. The reversal of 28772480 is 8427782.

It is a tau number, because it is divible by the number of its divisors (128).

It is not an unprimeable number, because it can be changed into a prime (28772489) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 429407 + ... + 429473.

Almost surely, 2^28772480 is an apocalyptic number.

28772480 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 28772480, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (38702880).

28772480 is an abundant number, since it is smaller than the sum of its proper divisors (48633280).

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

28772480 is a wasteful number, since it uses less digits than its factorization.

28772480 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 158 (or 146 counting only the distinct ones).

The product of its (nonzero) digits is 50176, while the sum is 38.

The square root of 28772480 is about 5363.9985085755. The cubic root of 28772480 is about 306.4261083448.

The spelling of 28772480 in words is "twenty-eight million, seven hundred seventy-two thousand, four hundred eighty".