15780012 has 48 divisors (see below), whose sum is σ = 39416832. Its totient is φ = 4896000.

The previous prime is 15780007. The next prime is 15780049. The reversal of 15780012 is 21008751.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 20637 + ... + 21387.

It is an arithmetic number, because the mean of its divisors is an integer number (821184).

Almost surely, 2^15780012 is an apocalyptic number.

15780012 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 15780012, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (19708416).

15780012 is an abundant number, since it is smaller than the sum of its proper divisors (23636820).

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

15780012 is a wasteful number, since it uses less digits than its factorization.

15780012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 878 (or 876 counting only the distinct ones).

The product of its (nonzero) digits is 560, while the sum is 24.

The square root of 15780012 is about 3972.4063236280. The cubic root of 15780012 is about 250.8240117015.

Adding to 15780012 its reverse (21008751), we get a palindrome (36788763).

The spelling of 15780012 in words is "fifteen million, seven hundred eighty thousand, twelve".