1634663544 has 64 divisors (see below), whose sum is σ = 4270717440. Its totient is φ = 520417920.

The previous prime is 1634663539. The next prime is 1634663549. The reversal of 1634663544 is 4453664361.

It is an interprime number because it is at equal distance from previous prime (1634663539) and next prime (1634663549).

It is a junction number, because it is equal to n+sod(n) for n = 1634663496 and 1634663505.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1634663549) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 451389 + ... + 454995.

It is an arithmetic number, because the mean of its divisors is an integer number (66729960).

Almost surely, 2^1634663544 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1634663544, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2135358720).

1634663544 is an abundant number, since it is smaller than the sum of its proper divisors (2636053896).

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

1634663544 is a wasteful number, since it uses less digits than its factorization.

1634663544 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4460 (or 4456 counting only the distinct ones).

The product of its digits is 622080, while the sum is 42.

The square root of 1634663544 is about 40430.9725829098. The cubic root of 1634663544 is about 1177.9932241629.

The spelling of 1634663544 in words is "one billion, six hundred thirty-four million, six hundred sixty-three thousand, five hundred forty-four".