57426781 has 2 divisors, whose sum is σ = 57426782. Its totient is φ = 57426780.

The previous prime is 57426763. The next prime is 57426821. The reversal of 57426781 is 18762475.

It is an a-pointer prime, because the next prime (57426821) can be obtained adding 57426781 to its sum of digits (40).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 47403225 + 10023556 = 6885^2 + 3166^2 .

It is a cyclic number.

It is not a de Polignac number, because 57426781 - 2⁵ = 57426749 is a prime.

It is a super-2 number, since 2×57426781² = 6595670352043922, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (57426751) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28713390 + 28713391.

It is an arithmetic number, because the mean of its divisors is an integer number (28713391).

Almost surely, 2^57426781 is an apocalyptic number.

It is an amenable number.

57426781 is a deficient number, since it is larger than the sum of its proper divisors (1).

57426781 is an equidigital number, since it uses as much as digits as its factorization.

57426781 is an evil number, because the sum of its binary digits is even.

The product of its digits is 94080, while the sum is 40.

The square root of 57426781 is about 7578.0459882479. The cubic root of 57426781 is about 385.8082329326.

The spelling of 57426781 in words is "fifty-seven million, four hundred twenty-six thousand, seven hundred eighty-one".