1226772820 has 72 divisors (see below), whose sum is σ = 3227389704. Its totient is φ = 388249344.

The previous prime is 1226772797. The next prime is 1226772839. The reversal of 1226772820 is 282776221.

It can be written as a sum of positive squares in 4 ways, for example, as 20322064 + 1206450756 = 4508^2 + 34734^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 1226772820.

It is a congruent number.

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 23 ways as a sum of consecutive naturals, for example, 35407 + ... + 60886.

It is an arithmetic number, because the mean of its divisors is an integer number (44824857).

Almost surely, 2^1226772820 is an apocalyptic number.

1226772820 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1226772820 is an abundant number, since it is smaller than the sum of its proper divisors (2000616884).

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

1226772820 is a wasteful number, since it uses less digits than its factorization.

1226772820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 96329 (or 96320 counting only the distinct ones).

The product of its (nonzero) digits is 37632, while the sum is 37.

The square root of 1226772820 is about 35025.3168436775. The cubic root of 1226772820 is about 1070.5033937292.

The spelling of 1226772820 in words is "one billion, two hundred twenty-six million, seven hundred seventy-two thousand, eight hundred twenty".