2540307640 has 64 divisors (see below), whose sum is σ = 6187829760. Its totient is φ = 933012480.

The previous prime is 2540307629. The next prime is 2540307673. The reversal of 2540307640 is 467030452.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 86532 + ... + 112108.

It is an arithmetic number, because the mean of its divisors is an integer number (96684840).

Almost surely, 2^2540307640 is an apocalyptic number.

2540307640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2540307640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3093914880).

2540307640 is an abundant number, since it is smaller than the sum of its proper divisors (3647522120).

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

2540307640 is a wasteful number, since it uses less digits than its factorization.

2540307640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25792 (or 25788 counting only the distinct ones).

The product of its (nonzero) digits is 20160, while the sum is 31.

The square root of 2540307640 is about 50401.4646612576. The cubic root of 2540307640 is about 1364.4640724183.

The spelling of 2540307640 in words is "two billion, five hundred forty million, three hundred seven thousand, six hundred forty".