1212728370 has 128 divisors (see below), whose sum is σ = 3467722752. Its totient is φ = 265593600.

The previous prime is 1212728359. The next prime is 1212728393. The reversal of 1212728370 is 738272121.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 695700 + ... + 697440.

It is an arithmetic number, because the mean of its divisors is an integer number (27091584).

Almost surely, 2^1212728370 is an apocalyptic number.

1212728370 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 1212728370, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1733861376).

1212728370 is an abundant number, since it is smaller than the sum of its proper divisors (2254994382).

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

1212728370 is a wasteful number, since it uses less digits than its factorization.

1212728370 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1896.

The product of its (nonzero) digits is 9408, while the sum is 33.

The square root of 1212728370 is about 34824.2497406620. The cubic root of 1212728370 is about 1066.4025603723.

The spelling of 1212728370 in words is "one billion, two hundred twelve million, seven hundred twenty-eight thousand, three hundred seventy".