1649539776 has 112 divisors (see below), whose sum is σ = 4477231584. Its totient is φ = 535781376.

The previous prime is 1649539769. The next prime is 1649539781. The reversal of 1649539776 is 6779359461.

It is a happy number.

It is a super-2 number, since 2×1649539776² = 5441962945212260352, which contains 22 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, 1759980 + ... + 1760916.

It is an arithmetic number, because the mean of its divisors is an integer number (39975282).

Almost surely, 2^1649539776 is an apocalyptic number.

1649539776 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1649539776, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2238615792).

1649539776 is an abundant number, since it is smaller than the sum of its proper divisors (2827691808).

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

1649539776 is a wasteful number, since it uses less digits than its factorization.

1649539776 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1178 (or 1168 counting only the distinct ones).

The product of its digits is 8573040, while the sum is 57.

The square root of 1649539776 is about 40614.5266622670. The cubic root of 1649539776 is about 1181.5558754153. Note that the first 3 decimals are identical.

The spelling of 1649539776 in words is "one billion, six hundred forty-nine million, five hundred thirty-nine thousand, seven hundred seventy-six".