257070766 has 4 divisors (see below), whose sum is σ = 385606152. Its totient is φ = 128535382.

The previous prime is 257070763. The next prime is 257070767. The reversal of 257070766 is 667070752.

It is a semiprime because it is the product of two primes.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (257070763) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64267690 + ... + 64267693.

It is an arithmetic number, because the mean of its divisors is an integer number (96401538).

Almost surely, 2^257070766 is an apocalyptic number.

257070766 is a deficient number, since it is larger than the sum of its proper divisors (128535386).

257070766 is a wasteful number, since it uses less digits than its factorization.

257070766 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 128535385.

The product of its (nonzero) digits is 123480, while the sum is 40.

The square root of 257070766 is about 16033.4265208657. The cubic root of 257070766 is about 635.8444680532.

The spelling of 257070766 in words is "two hundred fifty-seven million, seventy thousand, seven hundred sixty-six".