11278530 has 48 divisors (see below), whose sum is σ = 29610360. Its totient is φ = 2978304.

The previous prime is 11278529. The next prime is 11278537. The reversal of 11278530 is 3587211.

11278530 is a `hidden beast` number, since 1 + 127 + 8 + 530 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 2152089 + 9126441 = 1467^2 + 3021^2 .

It is a super-3 number, since 3×11278530³ (a number of 22 digits) contains 333 as substring.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 11278494 and 11278503.

It is not an unprimeable number, because it can be changed into a prime (11278537) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 9616 + ... + 10724.

Almost surely, 2^11278530 is an apocalyptic number.

11278530 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 11278530, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (14805180).

11278530 is an abundant number, since it is smaller than the sum of its proper divisors (18331830).

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

11278530 is a wasteful number, since it uses less digits than its factorization.

11278530 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1235 (or 1232 counting only the distinct ones).

The product of its (nonzero) digits is 1680, while the sum is 27.

The square root of 11278530 is about 3358.3522745537. The cubic root of 11278530 is about 224.2594914757.

The spelling of 11278530 in words is "eleven million, two hundred seventy-eight thousand, five hundred thirty".