51378657 has 12 divisors (see below), whose sum is σ = 75299280. Its totient is φ = 31138360.

The previous prime is 51378623. The next prime is 51378659. The reversal of 51378657 is 75687315.

It is not a de Polignac number, because 51378657 - 2⁷ = 51378529 is a prime.

It is not an unprimeable number, because it can be changed into a prime (51378659) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 70407 + ... + 71132.

It is an arithmetic number, because the mean of its divisors is an integer number (6274940).

Almost surely, 2^51378657 is an apocalyptic number.

It is an amenable number.

51378657 is a deficient number, since it is larger than the sum of its proper divisors (23920623).

51378657 is a wasteful number, since it uses less digits than its factorization.

51378657 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 141564 (or 141553 counting only the distinct ones).

The product of its digits is 176400, while the sum is 42.

The square root of 51378657 is about 7167.8906939211. The cubic root of 51378657 is about 371.7585075599.

The spelling of 51378657 in words is "fifty-one million, three hundred seventy-eight thousand, six hundred fifty-seven".