1645011312 has 160 divisors (see below), whose sum is σ = 5090150400. Its totient is φ = 447842304.

The previous prime is 1645011299. The next prime is 1645011331. The reversal of 1645011312 is 2131105461.

It is a happy number.

It is a super-2 number, since 2×1645011312² = 5412124433215922688, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 768708 + ... + 770844.

It is an arithmetic number, because the mean of its divisors is an integer number (31813440).

Almost surely, 2^1645011312 is an apocalyptic number.

1645011312 is a gapful number since it is divisible by the number (12) 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 1645011312, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2545075200).

1645011312 is an abundant number, since it is smaller than the sum of its proper divisors (3445139088).

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

1645011312 is a wasteful number, since it uses less digits than its factorization.

1645011312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2263 (or 2257 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 24.

The square root of 1645011312 is about 40558.7390336534. The cubic root of 1645011312 is about 1180.4736468748.

Adding to 1645011312 its reverse (2131105461), we get a palindrome (3776116773).

The spelling of 1645011312 in words is "one billion, six hundred forty-five million, eleven thousand, three hundred twelve".