1644293352 has 32 divisors (see below), whose sum is σ = 4426944480. Its totient is φ = 505936320.

The previous prime is 1644293327. The next prime is 1644293353. The reversal of 1644293352 is 2533924461.

It is a super-3 number, since 3×1644293352³ (a number of 29 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a self number, because there is not a number n which added to its sum of digits gives 1644293352.

It is not an unprimeable number, because it can be changed into a prime (1644293353) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2634774 + ... + 2635397.

It is an arithmetic number, because the mean of its divisors is an integer number (138342015).

Almost surely, 2^1644293352 is an apocalyptic number.

1644293352 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1644293352 is an abundant number, since it is smaller than the sum of its proper divisors (2782651128).

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

1644293352 is a wasteful number, since it uses less digits than its factorization.

1644293352 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5270193 (or 5270189 counting only the distinct ones).

The product of its digits is 155520, while the sum is 39.

The square root of 1644293352 is about 40549.8872008295. The cubic root of 1644293352 is about 1180.3018838836.

The spelling of 1644293352 in words is "one billion, six hundred forty-four million, two hundred ninety-three thousand, three hundred fifty-two".