2640925891 has 8 divisors (see below), whose sum is σ = 2689124480. Its totient is φ = 2593052352.

The previous prime is 2640925879. The next prime is 2640925897. The reversal of 2640925891 is 1985290462.

2640925891 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 2640925891 - 2⁹ = 2640925379 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2640925897) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 64836 + ... + 97393.

It is an arithmetic number, because the mean of its divisors is an integer number (336140560).

Almost surely, 2^2640925891 is an apocalyptic number.

2640925891 is a deficient number, since it is larger than the sum of its proper divisors (48198589).

2640925891 is a wasteful number, since it uses less digits than its factorization.

2640925891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 162525.

The product of its (nonzero) digits is 311040, while the sum is 46.

The square root of 2640925891 is about 51389.9395893788. The cubic root of 2640925891 is about 1382.2462003160.

The spelling of 2640925891 in words is "two billion, six hundred forty million, nine hundred twenty-five thousand, eight hundred ninety-one".