1143578520 has 256 divisors, whose sum is σ = 4379212800. Its totient is φ = 260029440.

The previous prime is 1143578477. The next prime is 1143578521. The reversal of 1143578520 is 258753411.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1143578521) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 2502132 + ... + 2502588.

It is an arithmetic number, because the mean of its divisors is an integer number (17106300).

Almost surely, 2^1143578520 is an apocalyptic number.

1143578520 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 1143578520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2189606400).

1143578520 is an abundant number, since it is smaller than the sum of its proper divisors (3235634280).

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

1143578520 is a wasteful number, since it uses less digits than its factorization.

1143578520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 815 (or 805 counting only the distinct ones).

The product of its (nonzero) digits is 33600, while the sum is 36.

The square root of 1143578520 is about 33816.8378178682. The cubic root of 1143578520 is about 1045.7358491733.

The spelling of 1143578520 in words is "one billion, one hundred forty-three million, five hundred seventy-eight thousand, five hundred twenty".