1644069156 has 48 divisors (see below), whose sum is σ = 3860158848. Its totient is φ = 544608000.

The previous prime is 1644069109. The next prime is 1644069173. The reversal of 1644069156 is 6519604461.

It is a super-3 number, since 3×1644069156³ (a number of 29 digits) contains 333 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, 2242566 + ... + 2243298.

It is an arithmetic number, because the mean of its divisors is an integer number (80419976).

Almost surely, 2^1644069156 is an apocalyptic number.

It is an amenable number.

1644069156 is an abundant number, since it is smaller than the sum of its proper divisors (2216089692).

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

1644069156 is a wasteful number, since it uses less digits than its factorization.

1644069156 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1652 (or 1650 counting only the distinct ones).

The product of its (nonzero) digits is 155520, while the sum is 42.

The square root of 1644069156 is about 40547.1226599373. The cubic root of 1644069156 is about 1180.2482375379.

The spelling of 1644069156 in words is "one billion, six hundred forty-four million, sixty-nine thousand, one hundred fifty-six".