2540564690 has 8 divisors (see below), whose sum is σ = 4573016460. Its totient is φ = 1016225872.

The previous prime is 2540564681. The next prime is 2540564717. The reversal of 2540564690 is 964650452.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 2538245161 + 2319529 = 50381^2 + 1523^2 .

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

It is a super-2 number, since 2×2540564690² = 12908937888149592200, which contains 22 as substring.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 127028225 + ... + 127028244.

Almost surely, 2^2540564690 is an apocalyptic number.

2540564690 is a deficient number, since it is larger than the sum of its proper divisors (2032451770).

2540564690 is a wasteful number, since it uses less digits than its factorization.

2540564690 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 254056476.

The product of its (nonzero) digits is 259200, while the sum is 41.

The square root of 2540564690 is about 50404.0146218533. The cubic root of 2540564690 is about 1364.5100935714.

The spelling of 2540564690 in words is "two billion, five hundred forty million, five hundred sixty-four thousand, six hundred ninety".