51728377 has 4 divisors (see below), whose sum is σ = 51891876. Its totient is φ = 51564880.

The previous prime is 51728333. The next prime is 51728381. The reversal of 51728377 is 77382715.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 77382715 = 5 ⋅15476543.

It can be written as a sum of positive squares in 2 ways, for example, as 2223081 + 49505296 = 1491^2 + 7036^2 .

It is a cyclic number.

It is not a de Polignac number, because 51728377 - 2⁷ = 51728249 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51728077) 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, 81274 + ... + 81907.

It is an arithmetic number, because the mean of its divisors is an integer number (12972969).

Almost surely, 2^51728377 is an apocalyptic number.

It is an amenable number.

51728377 is a deficient number, since it is larger than the sum of its proper divisors (163499).

51728377 is a wasteful number, since it uses less digits than its factorization.

51728377 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 163498.

The product of its digits is 82320, while the sum is 40.

The square root of 51728377 is about 7192.2442255530. The cubic root of 51728377 is about 372.6000860136.

The spelling of 51728377 in words is "fifty-one million, seven hundred twenty-eight thousand, three hundred seventy-seven".