12551620 has 24 divisors (see below), whose sum is σ = 26722584. Its totient is φ = 4951296.

The previous prime is 12551603. The next prime is 12551639. The reversal of 12551620 is 2615521.

It can be written as a sum of positive squares in 4 ways, for example, as 2515396 + 10036224 = 1586^2 + 3168^2 .

It is a junction number, because it is equal to n+sod(n) for n = 12551591 and 12551600.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2839 + ... + 5758.

It is an arithmetic number, because the mean of its divisors is an integer number (1113441).

Almost surely, 2^12551620 is an apocalyptic number.

12551620 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12551620 is an abundant number, since it is smaller than the sum of its proper divisors (14170964).

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

12551620 is a wasteful number, since it uses less digits than its factorization.

12551620 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8679 (or 8677 counting only the distinct ones).

The product of its (nonzero) digits is 600, while the sum is 22.

The square root of 12551620 is about 3542.8265551675. The cubic root of 12551620 is about 232.3984680199.

The spelling of 12551620 in words is "twelve million, five hundred fifty-one thousand, six hundred twenty".