1212728544 has 96 divisors (see below), whose sum is σ = 3690973440. Its totient is φ = 386660736.

The previous prime is 1212728533. The next prime is 1212728549. The reversal of 1212728544 is 4458272121.

It is a tau number, because it is divible by the number of its divisors (96).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 1212728499 and 1212728508.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1212728549) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10642 + ... + 50385.

It is an arithmetic number, because the mean of its divisors is an integer number (38447640).

Almost surely, 2^1212728544 is an apocalyptic number.

It is an amenable number.

1212728544 is an abundant number, since it is smaller than the sum of its proper divisors (2478244896).

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

1212728544 is a wasteful number, since it uses less digits than its factorization.

1212728544 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61069 (or 61055 counting only the distinct ones).

The product of its digits is 35840, while the sum is 36.

The square root of 1212728544 is about 34824.2522389211. The cubic root of 1212728544 is about 1066.4026113741.

The spelling of 1212728544 in words is "one billion, two hundred twelve million, seven hundred twenty-eight thousand, five hundred forty-four".