1220545800 has 96 divisors (see below), whose sum is σ = 4204120800. Its totient is φ = 325477440.

The previous prime is 1220545771. The next prime is 1220545801. The reversal of 1220545800 is 85450221.

It is a happy number.

1220545800 is a `hidden beast` number, since 1 + 2 + 205 + 458 + 0 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (1220545801) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 107614 + ... + 118413.

It is an arithmetic number, because the mean of its divisors is an integer number (43792925).

Almost surely, 2^1220545800 is an apocalyptic number.

1220545800 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1220545800 is an abundant number, since it is smaller than the sum of its proper divisors (2983575000).

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

1220545800 is a wasteful number, since it uses less digits than its factorization.

1220545800 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 226052 (or 226037 counting only the distinct ones).

The product of its (nonzero) digits is 3200, while the sum is 27.

The square root of 1220545800 is about 34936.3106237622. The cubic root of 1220545800 is about 1068.6890516182.

The spelling of 1220545800 in words is "one billion, two hundred twenty million, five hundred forty-five thousand, eight hundred".