2520545778 has 12 divisors (see below), whose sum is σ = 5461182558. Its totient is φ = 840181920.

The previous prime is 2520545777. The next prime is 2520545789. The reversal of 2520545778 is 8775450252.

2520545778 is a `hidden beast` number, since 2 + 5 + 20 + 54 + 577 + 8 = 666.

It can be written as a sum of positive squares in only one way, i.e., 1449096489 + 1071449289 = 38067^2 + 32733^2 .

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (2520545777) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 70015143 + ... + 70015178.

Almost surely, 2^2520545778 is an apocalyptic number.

2520545778 is an abundant number, since it is smaller than the sum of its proper divisors (2940636780).

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

2520545778 is a wasteful number, since it uses less digits than its factorization.

2520545778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 140030329 (or 140030326 counting only the distinct ones).

The product of its (nonzero) digits is 784000, while the sum is 45.

The square root of 2520545778 is about 50205.0373767414. The cubic root of 2520545778 is about 1360.9166574692.

The spelling of 2520545778 in words is "two billion, five hundred twenty million, five hundred forty-five thousand, seven hundred seventy-eight".