28019740 has 96 divisors (see below), whose sum is σ = 72745344. Its totient is φ = 8847360.

The previous prime is 28019729. The next prime is 28019743. The reversal of 28019740 is 4791082.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28019743) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 145084 + ... + 145276.

It is an arithmetic number, because the mean of its divisors is an integer number (757764).

Almost surely, 2^28019740 is an apocalyptic number.

28019740 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 28019740, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (36372672).

28019740 is an abundant number, since it is smaller than the sum of its proper divisors (44725604).

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

28019740 is a wasteful number, since it uses less digits than its factorization.

28019740 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 287 (or 285 counting only the distinct ones).

The product of its (nonzero) digits is 4032, while the sum is 31.

The square root of 28019740 is about 5293.3675481682. The cubic root of 28019740 is about 303.7302402654.

The spelling of 28019740 in words is "twenty-eight million, nineteen thousand, seven hundred forty".