2303721640 has 32 divisors (see below), whose sum is σ = 5654590560. Its totient is φ = 837716800.

The previous prime is 2303721619. The next prime is 2303721659. The reversal of 2303721640 is 461273032.

It is a junction number, because it is equal to n+sod(n) for n = 2303721599 and 2303721608.

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, 2617426 + ... + 2618305.

It is an arithmetic number, because the mean of its divisors is an integer number (176705955).

Almost surely, 2^2303721640 is an apocalyptic number.

2303721640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2303721640 is an abundant number, since it is smaller than the sum of its proper divisors (3350868920).

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

2303721640 is a wasteful number, since it uses less digits than its factorization.

2303721640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5235753 (or 5235749 counting only the distinct ones).

The product of its (nonzero) digits is 6048, while the sum is 28.

The square root of 2303721640 is about 47997.1003290824. The cubic root of 2303721640 is about 1320.7177073422.

Adding to 2303721640 its reverse (461273032), we get a palindrome (2764994672).

The spelling of 2303721640 in words is "two billion, three hundred three million, seven hundred twenty-one thousand, six hundred forty".