2520731648 has 26 divisors (see below), whose sum is σ = 5040856074. Its totient is φ = 1260363776.

The previous prime is 2520731641. The next prime is 2520731651. The reversal of 2520731648 is 8461370252.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 1484406784 + 1036324864 = 38528^2 + 32192^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2520731641) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 303611 + ... + 311802.

Almost surely, 2^2520731648 is an apocalyptic number.

It is an amenable number.

2520731648 is a deficient number, since it is larger than the sum of its proper divisors (2520124426).

2520731648 is an frugal number, since it uses more digits than its factorization.

2520731648 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 615437 (or 615415 counting only the distinct ones).

The product of its (nonzero) digits is 80640, while the sum is 38.

The square root of 2520731648 is about 50206.8884516856. Note that the first 3 decimals coincide. The cubic root of 2520731648 is about 1360.9501088701.

The spelling of 2520731648 in words is "two billion, five hundred twenty million, seven hundred thirty-one thousand, six hundred forty-eight".