2191548640 has 48 divisors (see below), whose sum is σ = 5184239760. Its totient is φ = 875484160.

The previous prime is 2191548607. The next prime is 2191548677. The reversal of 2191548640 is 468451912.

It is a Harshad number since it is a multiple of its sum of digits (40).

It is a junction number, because it is equal to n+sod(n) for n = 2191548593 and 2191548602.

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, 120975 + ... + 137905.

It is an arithmetic number, because the mean of its divisors is an integer number (108004995).

Almost surely, 2^2191548640 is an apocalyptic number.

2191548640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2191548640 is an abundant number, since it is smaller than the sum of its proper divisors (2992691120).

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

2191548640 is a wasteful number, since it uses less digits than its factorization.

2191548640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17755 (or 17747 counting only the distinct ones).

The product of its (nonzero) digits is 69120, while the sum is 40.

The square root of 2191548640 is about 46813.9791088089. The cubic root of 2191548640 is about 1298.9238905327.

The spelling of 2191548640 in words is "two billion, one hundred ninety-one million, five hundred forty-eight thousand, six hundred forty".