2557812440 has 16 divisors (see below), whose sum is σ = 5755078080. Its totient is φ = 1023124960.

The previous prime is 2557812437. The next prime is 2557812457. The reversal of 2557812440 is 442187552.

2557812440 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a junction number, because it is equal to n+sod(n) for n = 2557812394 and 2557812403.

It is a congruent 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, 31972616 + ... + 31972695.

It is an arithmetic number, because the mean of its divisors is an integer number (359692380).

Almost surely, 2^2557812440 is an apocalyptic number.

2557812440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2557812440 is an abundant number, since it is smaller than the sum of its proper divisors (3197265640).

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

2557812440 is a wasteful number, since it uses less digits than its factorization.

2557812440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63945322 (or 63945318 counting only the distinct ones).

The product of its (nonzero) digits is 89600, while the sum is 38.

The square root of 2557812440 is about 50574.8202171792. The cubic root of 2557812440 is about 1367.5909926563.

Adding to 2557812440 its reverse (442187552), we get a palindrome (2999999992).

The spelling of 2557812440 in words is "two billion, five hundred fifty-seven million, eight hundred twelve thousand, four hundred forty".