28542340 has 12 divisors (see below), whose sum is σ = 59938956. Its totient is φ = 11416928.

The previous prime is 28542323. The next prime is 28542341. The reversal of 28542340 is 4324582.

It can be written as a sum of positive squares in 2 ways, for example, as 18096516 + 10445824 = 4254^2 + 3232^2 .

It is a junction number, because it is equal to n+sod(n) for n = 28542299 and 28542308.

It is not an unprimeable number, because it can be changed into a prime (28542341) 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, 713539 + ... + 713578.

It is an arithmetic number, because the mean of its divisors is an integer number (4994913).

Almost surely, 2^28542340 is an apocalyptic number.

28542340 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28542340 is an abundant number, since it is smaller than the sum of its proper divisors (31396616).

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

28542340 is a wasteful number, since it uses less digits than its factorization.

28542340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1427126 (or 1427124 counting only the distinct ones).

The product of its (nonzero) digits is 7680, while the sum is 28.

The square root of 28542340 is about 5342.5031586327. The cubic root of 28542340 is about 305.6069254801.

It can be divided in two parts, 28542 and 340, that added together give a palindrome (28882).

The spelling of 28542340 in words is "twenty-eight million, five hundred forty-two thousand, three hundred forty".