2457681 has 8 divisors (see below), whose sum is σ = 3286560. Its totient is φ = 1633632.

The previous prime is 2457667. The next prime is 2457703. The reversal of 2457681 is 1867542.

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

It is not a de Polignac number, because 2457681 - 2⁶ = 2457617 is a prime.

It is a super-2 number, since 2×2457681² = 12080391795522, which contains 22 as substring.

It is a d-powerful number, because it can be written as 2 + 4³ + 5⁷ + 7⁴ + 6⁷ + 8⁷ + 1 .

It is not an unprimeable number, because it can be changed into a prime (2457641) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 226 + ... + 2228.

It is an arithmetic number, because the mean of its divisors is an integer number (410820).

2^2457681 is an apocalyptic number.

2457681 is the 992-nd centered pentagonal number.

It is an amenable number.

2457681 is a deficient number, since it is larger than the sum of its proper divisors (828879).

2457681 is a wasteful number, since it uses less digits than its factorization.

2457681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2415.

The product of its digits is 13440, while the sum is 33.

The square root of 2457681 is about 1567.6992696305. The cubic root of 2457681 is about 134.9507090285.

The spelling of 2457681 in words is "two million, four hundred fifty-seven thousand, six hundred eighty-one".