28771880 has 16 divisors (see below), whose sum is σ = 64736820. Its totient is φ = 11508736.

The previous prime is 28771819. The next prime is 28771889. The reversal of 28771880 is 8817782.

It can be written as a sum of positive squares in 2 ways, for example, as 27899524 + 872356 = 5282^2 + 934^2 .

It is not an unprimeable number, because it can be changed into a prime (28771889) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 359609 + ... + 359688.

Almost surely, 2^28771880 is an apocalyptic number.

28771880 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28771880 is an abundant number, since it is smaller than the sum of its proper divisors (35964940).

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

28771880 is a wasteful number, since it uses less digits than its factorization.

28771880 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 719308 (or 719304 counting only the distinct ones).

The product of its (nonzero) digits is 50176, while the sum is 41.

The square root of 28771880 is about 5363.9425798567. The cubic root of 28771880 is about 306.4239783356.

The spelling of 28771880 in words is "twenty-eight million, seven hundred seventy-one thousand, eight hundred eighty".