1143578020 has 48 divisors (see below), whose sum is σ = 2604934080. Its totient is φ = 419193216.

The previous prime is 1143577987. The next prime is 1143578021. The reversal of 1143578020 is 208753411.

It is not an unprimeable number, because it can be changed into a prime (1143578021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 20319 + ... + 51961.

It is an arithmetic number, because the mean of its divisors is an integer number (54269460).

Almost surely, 2^1143578020 is an apocalyptic number.

1143578020 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 1143578020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1302467040).

1143578020 is an abundant number, since it is smaller than the sum of its proper divisors (1461356060).

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

1143578020 is a wasteful number, since it uses less digits than its factorization.

1143578020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31804 (or 31802 counting only the distinct ones).

The product of its (nonzero) digits is 6720, while the sum is 31.

The square root of 1143578020 is about 33816.8304251005. The cubic root of 1143578020 is about 1045.7356967664.

The spelling of 1143578020 in words is "one billion, one hundred forty-three million, five hundred seventy-eight thousand, twenty".