2721891648 has 56 divisors (see below), whose sum is σ = 8230485952. Its totient is φ = 777682944.

The previous prime is 2721891637. The next prime is 2721891661. The reversal of 2721891648 is 8461981272.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (56).

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

It is a junction number, because it is equal to n+sod(n) for n = 2721891597 and 2721891606.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1011265 + ... + 1013952.

Almost surely, 2^2721891648 is an apocalyptic number.

2721891648 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

2721891648 is an abundant number, since it is smaller than the sum of its proper divisors (5508594304).

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

2721891648 is a wasteful number, since it uses less digits than its factorization.

2721891648 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2025239 (or 2025229 counting only the distinct ones).

The product of its digits is 387072, while the sum is 48.

The square root of 2721891648 is about 52171.7514369606. The cubic root of 2721891648 is about 1396.2299328707.

The spelling of 2721891648 in words is "two billion, seven hundred twenty-one million, eight hundred ninety-one thousand, six hundred forty-eight".