1220706780736 has 21 divisors (see below), whose sum is σ = 2422357557739. Its totient is φ = 610348970944.

The previous prime is 1220706780721. The next prime is 1220706780737. The reversal of 1220706780736 is 6370876070221.

It is a happy number.

The square root of 1220706780736 is 1104856.

It is a perfect power (a square), and thus also a powerful number.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1220706780736.

It is not an unprimeable number, because it can be changed into a prime (1220706780737) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 8769795 + ... + 8907901.

Almost surely, 2^{1220706780736} is an apocalyptic number.

1220706780736 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

1220706780736 is the 1104856-th square number.

It is an amenable number.

1220706780736 is a deficient number, since it is larger than the sum of its proper divisors (1201650777003).

1220706780736 is an frugal number, since it uses more digits than its factorization.

1220706780736 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 276226 (or 138109 counting only the distinct ones).

The product of its (nonzero) digits is 1185408, while the sum is 49.

Multiplying 1220706780736 by its sum of digits (49), we get a square (59814632256064 = 7733992²).

The spelling of 1220706780736 in words is "one trillion, two hundred twenty billion, seven hundred six million, seven hundred eighty thousand, seven hundred thirty-six".