1220549750 has 32 divisors (see below), whose sum is σ = 2611282752. Its totient is φ = 418473600.

The previous prime is 1220549723. The next prime is 1220549779. The reversal of 1220549750 is 579450221.

It is a Harshad number since it is a multiple of its sum of digits (35).

It is a self number, because there is not a number n which added to its sum of digits gives 1220549750.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 346979 + ... + 350478.

It is an arithmetic number, because the mean of its divisors is an integer number (81602586).

Almost surely, 2^1220549750 is an apocalyptic number.

1220549750 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1220549750 is an abundant number, since it is smaller than the sum of its proper divisors (1390733002).

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

1220549750 is an equidigital number, since it uses as much as digits as its factorization.

1220549750 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 697481 (or 697471 counting only the distinct ones).

The product of its (nonzero) digits is 25200, while the sum is 35.

The square root of 1220549750 is about 34936.3671551580. The cubic root of 1220549750 is about 1068.6902044678.

Adding to 1220549750 its reverse (579450221), we get a palindrome (1799999971).

The spelling of 1220549750 in words is "one billion, two hundred twenty million, five hundred forty-nine thousand, seven hundred fifty".