28771960 has 64 divisors (see below), whose sum is σ = 74488320. Its totient is φ = 9797760.

The previous prime is 28771957. The next prime is 28771961. The reversal of 28771960 is 6917782.

It is a Harshad number since it is a multiple of its sum of digits (40).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28771961) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 58837 + ... + 59323.

It is an arithmetic number, because the mean of its divisors is an integer number (1163880).

Almost surely, 2^28771960 is an apocalyptic number.

28771960 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 28771960, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (37244160).

28771960 is an abundant number, since it is smaller than the sum of its proper divisors (45716360).

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

28771960 is a wasteful number, since it uses less digits than its factorization.

28771960 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 716 (or 712 counting only the distinct ones).

The product of its (nonzero) digits is 42336, while the sum is 40.

The square root of 28771960 is about 5363.9500370529. The cubic root of 28771960 is about 306.4242623385.

The spelling of 28771960 in words is "twenty-eight million, seven hundred seventy-one thousand, nine hundred sixty".