1145720520 has 192 divisors, whose sum is σ = 4479696000. Its totient is φ = 248085504.

The previous prime is 1145720519. The next prime is 1145720549. The reversal of 1145720520 is 250275411.

1145720520 is a `hidden beast` number, since 1 + 1 + 457 + 205 + 2 + 0 = 666.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 35916 + ... + 59844.

It is an arithmetic number, because the mean of its divisors is an integer number (23331750).

Almost surely, 2^1145720520 is an apocalyptic number.

1145720520 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 1145720520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2239848000).

1145720520 is an abundant number, since it is smaller than the sum of its proper divisors (3333975480).

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

1145720520 is a wasteful number, since it uses less digits than its factorization.

1145720520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23972 (or 23965 counting only the distinct ones).

The product of its (nonzero) digits is 2800, while the sum is 27.

The square root of 1145720520 is about 33848.4936149306. The cubic root of 1145720520 is about 1046.3883532988.

Adding to 1145720520 its reverse (250275411), we get a palindrome (1395995931).

The spelling of 1145720520 in words is "one billion, one hundred forty-five million, seven hundred twenty thousand, five hundred twenty".