28366340 has 24 divisors (see below), whose sum is σ = 60388440. Its totient is φ = 11190528.

The previous prime is 28366313. The next prime is 28366343. The reversal of 28366340 is 4366382.

It can be written as a sum of positive squares in 4 ways, for example, as 64 + 28366276 = 8^2 + 5326^2 .

It is a junction number, because it is equal to n+sod(n) for n = 28366297 and 28366306.

It is not an unprimeable number, because it can be changed into a prime (28366343) 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, 8255 + ... + 11174.

It is an arithmetic number, because the mean of its divisors is an integer number (2516185).

Almost surely, 2^28366340 is an apocalyptic number.

28366340 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28366340 is an abundant number, since it is smaller than the sum of its proper divisors (32022100).

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

28366340 is a wasteful number, since it uses less digits than its factorization.

28366340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19511 (or 19509 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 32.

The square root of 28366340 is about 5326.0060082580. The cubic root of 28366340 is about 304.9774775092.

The spelling of 28366340 in words is "twenty-eight million, three hundred sixty-six thousand, three hundred forty".