27430820 has 12 divisors (see below), whose sum is σ = 57604764. Its totient is φ = 10972320.

The previous prime is 27430787. The next prime is 27430829. The reversal of 27430820 is 2803472.

It can be written as a sum of positive squares in 2 ways, for example, as 16711744 + 10719076 = 4088^2 + 3274^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 27430820.

It is not an unprimeable number, because it can be changed into a prime (27430829) 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, 685751 + ... + 685790.

It is an arithmetic number, because the mean of its divisors is an integer number (4800397).

Almost surely, 2^27430820 is an apocalyptic number.

27430820 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

27430820 is an abundant number, since it is smaller than the sum of its proper divisors (30173944).

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

27430820 is a wasteful number, since it uses less digits than its factorization.

27430820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1371550 (or 1371548 counting only the distinct ones).

The product of its (nonzero) digits is 2688, while the sum is 26.

The square root of 27430820 is about 5237.4440331139. Note that the first 3 decimals coincide. The cubic root of 27430820 is about 301.5872172909.

The spelling of 27430820 in words is "twenty-seven million, four hundred thirty thousand, eight hundred twenty".