1649571456 has 128 divisors (see below), whose sum is σ = 4735362240. Its totient is φ = 505774080.

The previous prime is 1649571449. The next prime is 1649571487. The reversal of 1649571456 is 6541759461.

It is a tau number, because it is divible by the number of its divisors (128).

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

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, 2450736 + ... + 2451408.

Almost surely, 2^1649571456 is an apocalyptic number.

1649571456 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 1649571456, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2367681120).

1649571456 is an abundant number, since it is smaller than the sum of its proper divisors (3085790784).

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

1649571456 is a wasteful number, since it uses less digits than its factorization.

1649571456 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1194 (or 1182 counting only the distinct ones).

The product of its digits is 907200, while the sum is 48.

The square root of 1649571456 is about 40614.9166686330. The cubic root of 1649571456 is about 1181.5634394342.

The spelling of 1649571456 in words is "one billion, six hundred forty-nine million, five hundred seventy-one thousand, four hundred fifty-six".