51328457 has 8 divisors (see below), whose sum is σ = 54457992. Its totient is φ = 48211200.

The previous prime is 51328441. The next prime is 51328469. The reversal of 51328457 is 75482315.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 7557001 + 43771456 = 2749^2 + 6616^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 51328457 - 2⁴ = 51328441 is a prime.

It is a super-2 number, since 2×51328457² = 5269220996001698, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51348457) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6407 + ... + 11987.

It is an arithmetic number, because the mean of its divisors is an integer number (6807249).

Almost surely, 2^51328457 is an apocalyptic number.

It is an amenable number.

51328457 is a deficient number, since it is larger than the sum of its proper divisors (3129535).

51328457 is a wasteful number, since it uses less digits than its factorization.

51328457 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6139.

The product of its digits is 33600, while the sum is 35.

The square root of 51328457 is about 7164.3881106484. The cubic root of 51328457 is about 371.6373913902.

The spelling of 51328457 in words is "fifty-one million, three hundred twenty-eight thousand, four hundred fifty-seven".