12261400528 has 40 divisors (see below), whose sum is σ = 25753379456. Its totient is φ = 5621616000.

The previous prime is 12261400523. The next prime is 12261400531. The reversal of 12261400528 is 82500416221.

It is a self number, because there is not a number n which added to its sum of digits gives 12261400528.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12261400523) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 163788 + ... + 226603.

Almost surely, 2^12261400528 is an apocalyptic number.

It is an amenable number.

12261400528 is an abundant number, since it is smaller than the sum of its proper divisors (13491978928).

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

12261400528 is a wasteful number, since it uses less digits than its factorization.

12261400528 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 390563 (or 390557 counting only the distinct ones).

The product of its (nonzero) digits is 7680, while the sum is 31.

Adding to 12261400528 its reverse (82500416221), we get a palindrome (94761816749).

The spelling of 12261400528 in words is "twelve billion, two hundred sixty-one million, four hundred thousand, five hundred twenty-eight".