2721662391 has 96 divisors (see below), whose sum is σ = 4655198208. Its totient is φ = 1382883840.

The previous prime is 2721662387. The next prime is 2721662393. The reversal of 2721662391 is 1932661272.

2721662391 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 2721662391 - 2² = 2721662387 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2721662393) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 8695251 + ... + 8695563.

It is an arithmetic number, because the mean of its divisors is an integer number (48491648).

Almost surely, 2^2721662391 is an apocalyptic number.

2721662391 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

2721662391 is a deficient number, since it is larger than the sum of its proper divisors (1933535817).

2721662391 is a wasteful number, since it uses less digits than its factorization.

2721662391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 429 (or 410 counting only the distinct ones).

The product of its digits is 54432, while the sum is 39.

The square root of 2721662391 is about 52169.5542534149. The cubic root of 2721662391 is about 1396.1907316442.

The spelling of 2721662391 in words is "two billion, seven hundred twenty-one million, six hundred sixty-two thousand, three hundred ninety-one".