1145565640 has 64 divisors (see below), whose sum is σ = 2631366000. Its totient is φ = 448745472.

The previous prime is 1145565611. The next prime is 1145565667. The reversal of 1145565640 is 465655411.

It can be written as a sum of positive squares in 8 ways, for example, as 131652676 + 1013912964 = 11474^2 + 31842^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 1145565640.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 433764 + ... + 436396.

Almost surely, 2^1145565640 is an apocalyptic number.

1145565640 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 1145565640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1315683000).

1145565640 is an abundant number, since it is smaller than the sum of its proper divisors (1485800360).

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

1145565640 is a wasteful number, since it uses less digits than its factorization.

1145565640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2866 (or 2862 counting only the distinct ones).

The product of its (nonzero) digits is 72000, while the sum is 37.

The square root of 1145565640 is about 33846.2056957645. The cubic root of 1145565640 is about 1046.3412004581.

The spelling of 1145565640 in words is "one billion, one hundred forty-five million, five hundred sixty-five thousand, six hundred forty".