28827720 has 48 divisors (see below), whose sum is σ = 93691260. Its totient is φ = 7687296.

The previous prime is 28827709. The next prime is 28827739. The reversal of 28827720 is 2772882.

It can be written as a sum of positive squares in 2 ways, for example, as 28579716 + 248004 = 5346^2 + 498^2 .

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 39679 + ... + 40398.

Almost surely, 2^28827720 is an apocalyptic number.

28827720 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28827720 is an abundant number, since it is smaller than the sum of its proper divisors (64863540).

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

28827720 is a wasteful number, since it uses less digits than its factorization.

28827720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80094 (or 80087 counting only the distinct ones).

The product of its (nonzero) digits is 25088, while the sum is 36.

The square root of 28827720 is about 5369.1451833602. The cubic root of 28827720 is about 306.6220844664.

The spelling of 28827720 in words is "twenty-eight million, eight hundred twenty-seven thousand, seven hundred twenty".