2540790640 has 40 divisors (see below), whose sum is σ = 5933870208. Its totient is φ = 1011751680.

The previous prime is 2540790631. The next prime is 2540790647. The reversal of 2540790640 is 460970452.

2540790640 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (40).

It is a self number, because there is not a number n which added to its sum of digits gives 2540790640.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2540790647) 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, 53371 + ... + 89050.

Almost surely, 2^2540790640 is an apocalyptic number.

2540790640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2540790640 is an abundant number, since it is smaller than the sum of its proper divisors (3393079568).

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

2540790640 is a wasteful number, since it uses less digits than its factorization.

2540790640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 142657 (or 142651 counting only the distinct ones).

The product of its (nonzero) digits is 60480, while the sum is 37.

The square root of 2540790640 is about 50406.2559609420. The cubic root of 2540790640 is about 1364.5505441475.

The spelling of 2540790640 in words is "two billion, five hundred forty million, seven hundred ninety thousand, six hundred forty".