1644415542 has 192 divisors, whose sum is σ = 4756796928. Its totient is φ = 397440000.

The previous prime is 1644415537. The next prime is 1644415543. The reversal of 1644415542 is 2455144461.

1644415542 is a `hidden beast` number, since 1 + 64 + 4 + 41 + 554 + 2 = 666.

It is a junction number, because it is equal to n+sod(n) for n = 1644415497 and 1644415506.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1644415543) 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 95 ways as a sum of consecutive naturals, for example, 2379417 + ... + 2380107.

It is an arithmetic number, because the mean of its divisors is an integer number (24774984).

Almost surely, 2^1644415542 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1644415542, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2378398464).

1644415542 is an abundant number, since it is smaller than the sum of its proper divisors (3112381386).

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

1644415542 is a wasteful number, since it uses less digits than its factorization.

1644415542 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 835 (or 832 counting only the distinct ones).

The product of its digits is 76800, while the sum is 36.

The square root of 1644415542 is about 40551.3938354775. The cubic root of 1644415542 is about 1180.3311198499.

The spelling of 1644415542 in words is "one billion, six hundred forty-four million, four hundred fifteen thousand, five hundred forty-two".