1220278807800 has 384 divisors, whose sum is σ = 4530376704000. Its totient is φ = 300119385600.

The previous prime is 1220278807799. The next prime is 1220278807801. The reversal of 1220278807800 is 87088720221.

1220278807800 is a `hidden beast` number, since 1 + 220 + 278 + 80 + 7 + 80 + 0 = 666.

It is an interprime number because it is at equal distance from previous prime (1220278807799) and next prime (1220278807801).

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1220278807801) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 89779005 + ... + 89792595.

It is an arithmetic number, because the mean of its divisors is an integer number (11797856000).

Almost surely, 2^{1220278807800} is an apocalyptic number.

1220278807800 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 1220278807800, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2265188352000).

1220278807800 is an abundant number, since it is smaller than the sum of its proper divisors (3310097896200).

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

1220278807800 is a wasteful number, since it uses less digits than its factorization.

1220278807800 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14908 (or 14893 counting only the distinct ones).

The product of its (nonzero) digits is 200704, while the sum is 45.

The spelling of 1220278807800 in words is "one trillion, two hundred twenty billion, two hundred seventy-eight million, eight hundred seven thousand, eight hundred".