1220377636 has 6 divisors (see below), whose sum is σ = 2135660870. Its totient is φ = 610188816.

The previous prime is 1220377579. The next prime is 1220377637. The reversal of 1220377636 is 6367730221.

It can be written as a sum of positive squares in only one way, i.e., 634737636 + 585640000 = 25194^2 + 24200^2 .

It is a junction number, because it is equal to n+sod(n) for n = 1220377595 and 1220377604.

It is not an unprimeable number, because it can be changed into a prime (1220377637) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 152547201 + ... + 152547208.

Almost surely, 2^1220377636 is an apocalyptic number.

It is an amenable number.

1220377636 is a deficient number, since it is larger than the sum of its proper divisors (915283234).

1220377636 is a wasteful number, since it uses less digits than its factorization.

1220377636 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 305094413 (or 305094411 counting only the distinct ones).

The product of its (nonzero) digits is 63504, while the sum is 37.

The square root of 1220377636 is about 34933.9038184970. The cubic root of 1220377636 is about 1068.6399688554.

The spelling of 1220377636 in words is "one billion, two hundred twenty million, three hundred seventy-seven thousand, six hundred thirty-six".