57226781 has 4 divisors (see below), whose sum is σ = 58032864. Its totient is φ = 56420700.

The previous prime is 57226769. The next prime is 57226801. The reversal of 57226781 is 18762275.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 57226781 - 2¹⁴ = 57210397 is a prime.

It is a super-2 number, since 2×57226781² = 6549808927243922, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (57226751) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 402935 + ... + 403076.

It is an arithmetic number, because the mean of its divisors is an integer number (14508216).

Almost surely, 2^57226781 is an apocalyptic number.

It is an amenable number.

57226781 is a deficient number, since it is larger than the sum of its proper divisors (806083).

57226781 is an equidigital number, since it uses as much as digits as its factorization.

57226781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 806082.

The product of its digits is 47040, while the sum is 38.

The square root of 57226781 is about 7564.8384648980. The cubic root of 57226781 is about 385.3598277587.

The spelling of 57226781 in words is "fifty-seven million, two hundred twenty-six thousand, seven hundred eighty-one".