1065644220 has 48 divisors (see below), whose sum is σ = 3080060928. Its totient is φ = 275004480.

The previous prime is 1065644159. The next prime is 1065644227. The reversal of 1065644220 is 224465601.

It is a super-2 number, since 2×1065644220² = 2271195207238816800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1065644227) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 284604 + ... + 288323.

It is an arithmetic number, because the mean of its divisors is an integer number (64167936).

Almost surely, 2^1065644220 is an apocalyptic number.

1065644220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1065644220 is an abundant number, since it is smaller than the sum of its proper divisors (2014416708).

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

1065644220 is a wasteful number, since it uses less digits than its factorization.

1065644220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 572970 (or 572968 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 30.

The square root of 1065644220 is about 32644.2065304090. The cubic root of 1065644220 is about 1021.4193427742.

The spelling of 1065644220 in words is "one billion, sixty-five million, six hundred forty-four thousand, two hundred twenty".