1220628742 has 16 divisors (see below), whose sum is σ = 1979400240. Its totient is φ = 562565088.

The previous prime is 1220628709. The next prime is 1220628767. The reversal of 1220628742 is 2478260221.

It is a junction number, because it is equal to n+sod(n) for n = 1220628698 and 1220628707.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 432673 + ... + 435484.

It is an arithmetic number, because the mean of its divisors is an integer number (123712515).

Almost surely, 2^1220628742 is an apocalyptic number.

1220628742 is a deficient number, since it is larger than the sum of its proper divisors (758771498).

1220628742 is a wasteful number, since it uses less digits than its factorization.

1220628742 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 868215.

The product of its (nonzero) digits is 21504, while the sum is 34.

The square root of 1220628742 is about 34937.4976493738. The cubic root of 1220628742 is about 1068.7132586026.

Adding to 1220628742 its reverse (2478260221), we get a palindrome (3698888963).

The spelling of 1220628742 in words is "one billion, two hundred twenty million, six hundred twenty-eight thousand, seven hundred forty-two".