28037820 has 24 divisors (see below), whose sum is σ = 78506064. Its totient is φ = 7476736.

The previous prime is 28037791. The next prime is 28037827. The reversal of 28037820 is 2873082.

It is a super-2 number, since 2×28037820² = 1572238700704800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28037827) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 233589 + ... + 233708.

It is an arithmetic number, because the mean of its divisors is an integer number (3271086).

Almost surely, 2^28037820 is an apocalyptic number.

28037820 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28037820 is an abundant number, since it is smaller than the sum of its proper divisors (50468244).

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

28037820 is a wasteful number, since it uses less digits than its factorization.

28037820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 467309 (or 467307 counting only the distinct ones).

The product of its (nonzero) digits is 5376, while the sum is 30.

The square root of 28037820 is about 5295.0750702894. The cubic root of 28037820 is about 303.7955544812.

The spelling of 28037820 in words is "twenty-eight million, thirty-seven thousand, eight hundred twenty".