28047340 has 12 divisors (see below), whose sum is σ = 58899456. Its totient is φ = 11218928.

The previous prime is 28047329. The next prime is 28047347. The reversal of 28047340 is 4374082.

It is a junction number, because it is equal to n+sod(n) for n = 28047299 and 28047308.

It is not an unprimeable number, because it can be changed into a prime (28047347) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 701164 + ... + 701203.

It is an arithmetic number, because the mean of its divisors is an integer number (4908288).

Almost surely, 2^28047340 is an apocalyptic number.

28047340 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28047340 is an abundant number, since it is smaller than the sum of its proper divisors (30852116).

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

28047340 is a wasteful number, since it uses less digits than its factorization.

28047340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1402376 (or 1402374 counting only the distinct ones).

The product of its (nonzero) digits is 5376, while the sum is 28.

The square root of 28047340 is about 5295.9739425341. The cubic root of 28047340 is about 303.8299343106.

The spelling of 28047340 in words is "twenty-eight million, forty-seven thousand, three hundred forty".