1644662496 has 48 divisors (see below), whose sum is σ = 4544467200. Its totient is φ = 519366528.

The previous prime is 1644662483. The next prime is 1644662497. The reversal of 1644662496 is 6942664461.

It is a tau number, because it is divible by the number of its divisors (48).

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1644662497) 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, 449016 + ... + 452663.

It is an arithmetic number, because the mean of its divisors is an integer number (94676400).

Almost surely, 2^1644662496 is an apocalyptic number.

1644662496 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

1644662496 is an abundant number, since it is smaller than the sum of its proper divisors (2899804704).

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

1644662496 is a wasteful number, since it uses less digits than its factorization.

1644662496 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 901711 (or 901703 counting only the distinct ones).

The product of its digits is 1492992, while the sum is 48.

The square root of 1644662496 is about 40554.4386719876. The cubic root of 1644662496 is about 1180.3902032331.

The spelling of 1644662496 in words is "one billion, six hundred forty-four million, six hundred sixty-two thousand, four hundred ninety-six".