1220562500 has 84 divisors (see below), whose sum is σ = 2723402640. Its totient is φ = 478500000.

The previous prime is 1220562479. The next prime is 1220562521. The reversal of 1220562500 is 52650221.

It is an interprime number because it is at equal distance from previous prime (1220562479) and next prime (1220562521).

It is a nialpdrome in base 5.

It is an unprimeable number.

It is a polite number, since it can be written in 27 ways as a sum of consecutive naturals, for example, 3687335 + ... + 3687665.

It is an arithmetic number, because the mean of its divisors is an integer number (32421460).

Almost surely, 2^1220562500 is an apocalyptic number.

1220562500 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1220562500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1361701320).

1220562500 is an abundant number, since it is smaller than the sum of its proper divisors (1502840140).

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

1220562500 is an frugal number, since it uses more digits than its factorization.

1220562500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 424 (or 397 counting only the distinct ones).

The product of its (nonzero) digits is 1200, while the sum is 23.

The square root of 1220562500 is about 34936.5496292922. The cubic root of 1220562500 is about 1068.6939256742.

The spelling of 1220562500 in words is "one billion, two hundred twenty million, five hundred sixty-two thousand, five hundred".