1065210640 has 80 divisors (see below), whose sum is σ = 2693796336. Its totient is φ = 389376000.

The previous prime is 1065210637. The next prime is 1065210691. The reversal of 1065210640 is 460125601.

It can be written as a sum of positive squares in 8 ways, for example, as 22695696 + 1042514944 = 4764^2 + 32288^2 .

It is a tau number, because it is divible by the number of its divisors (80).

It is a super-2 number, since 2×1065210640² = 2269347415138419200, which contains 22 as substring.

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, 99970 + ... + 110110.

Almost surely, 2^1065210640 is an apocalyptic number.

1065210640 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 1065210640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1346898168).

1065210640 is an abundant number, since it is smaller than the sum of its proper divisors (1628585696).

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

1065210640 is a wasteful number, since it uses less digits than its factorization.

1065210640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10268 (or 10262 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 25.

The square root of 1065210640 is about 32637.5648601424. The cubic root of 1065210640 is about 1021.2807952593.

The spelling of 1065210640 in words is "one billion, sixty-five million, two hundred ten thousand, six hundred forty".