51257378 has 4 divisors (see below), whose sum is σ = 76886070. Its totient is φ = 25628688.

The previous prime is 51257377. The next prime is 51257407. The reversal of 51257378 is 87375215.

It is a happy number.

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

It can be written as a sum of positive squares in only one way, i.e., 50310649 + 946729 = 7093^2 + 973^2 .

It is not an unprimeable number, because it can be changed into a prime (51257377) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12814343 + ... + 12814346.

Almost surely, 2^51257378 is an apocalyptic number.

51257378 is a deficient number, since it is larger than the sum of its proper divisors (25628692).

51257378 is a wasteful number, since it uses less digits than its factorization.

51257378 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25628691.

The product of its digits is 58800, while the sum is 38.

The square root of 51257378 is about 7159.4258149659. The cubic root of 51257378 is about 371.4657658864.

The spelling of 51257378 in words is "fifty-one million, two hundred fifty-seven thousand, three hundred seventy-eight".