1644774492 has 24 divisors (see below), whose sum is σ = 3851376256. Its totient is φ = 546319728.

The previous prime is 1644774451. The next prime is 1644774517. The reversal of 1644774492 is 2944774461.

It is a Smith number, since the sum of its digits (48) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 238768 + ... + 245559.

Almost surely, 2^1644774492 is an apocalyptic number.

1644774492 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1644774492 is an abundant number, since it is smaller than the sum of its proper divisors (2206601764).

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

1644774492 is a wasteful number, since it uses less digits than its factorization.

1644774492 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 484617 (or 484615 counting only the distinct ones).

The product of its digits is 1354752, while the sum is 48.

The square root of 1644774492 is about 40555.8194591109. The cubic root of 1644774492 is about 1180.4169961629.

The spelling of 1644774492 in words is "one billion, six hundred forty-four million, seven hundred seventy-four thousand, four hundred ninety-two".