2557423640 has 32 divisors (see below), whose sum is σ = 5756704560. Its totient is φ = 1022524800.

The previous prime is 2557423591. The next prime is 2557423663. The reversal of 2557423640 is 463247552.

It is a Smith number, since the sum of its digits (38) coincides with the sum of the digits of its prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 2557423594 and 2557423603.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 88610 + ... + 113870.

Almost surely, 2^2557423640 is an apocalyptic number.

2557423640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2557423640 is an abundant number, since it is smaller than the sum of its proper divisors (3199280920).

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

2557423640 is a wasteful number, since it uses less digits than its factorization.

2557423640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27803 (or 27799 counting only the distinct ones).

The product of its (nonzero) digits is 201600, while the sum is 38.

The square root of 2557423640 is about 50570.9762610927. The cubic root of 2557423640 is about 1367.5216956386.

The spelling of 2557423640 in words is "two billion, five hundred fifty-seven million, four hundred twenty-three thousand, six hundred forty".