28713140 has 12 divisors (see below), whose sum is σ = 60297636. Its totient is φ = 11485248.

The previous prime is 28713137. The next prime is 28713143. The reversal of 28713140 is 4131782.

It is an interprime number because it is at equal distance from previous prime (28713137) and next prime (28713143).

It can be written as a sum of positive squares in 2 ways, for example, as 14303524 + 14409616 = 3782^2 + 3796^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28713143) 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, 717809 + ... + 717848.

It is an arithmetic number, because the mean of its divisors is an integer number (5024803).

Almost surely, 2^28713140 is an apocalyptic number.

28713140 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28713140 is an abundant number, since it is smaller than the sum of its proper divisors (31584496).

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

28713140 is a wasteful number, since it uses less digits than its factorization.

28713140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1435666 (or 1435664 counting only the distinct ones).

The product of its (nonzero) digits is 1344, while the sum is 26.

The square root of 28713140 is about 5358.4643322504. The cubic root of 28713140 is about 306.2153069127.

The spelling of 28713140 in words is "twenty-eight million, seven hundred thirteen thousand, one hundred forty".