51328805 has 24 divisors (see below), whose sum is σ = 69563256. Its totient is φ = 36305280.

The previous prime is 51328793. The next prime is 51328817. The reversal of 51328805 is 50882315.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (51328793) and next prime (51328817).

It can be written as a sum of positive squares in 4 ways, for example, as 9351364 + 41977441 = 3058^2 + 6479^2 .

It is not a de Polignac number, because 51328805 - 2⁸ = 51328549 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 21239 + ... + 23531.

It is an arithmetic number, because the mean of its divisors is an integer number (2898469).

Almost surely, 2^51328805 is an apocalyptic number.

51328805 is a gapful number since it is divisible by the number (55) formed by its first and last digit.

It is an amenable number.

51328805 is a deficient number, since it is larger than the sum of its proper divisors (18234451).

51328805 is a wasteful number, since it uses less digits than its factorization.

51328805 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2357 (or 2346 counting only the distinct ones).

The product of its (nonzero) digits is 9600, while the sum is 32.

The square root of 51328805 is about 7164.4123973987. The cubic root of 51328805 is about 371.6382312720.

The spelling of 51328805 in words is "fifty-one million, three hundred twenty-eight thousand, eight hundred five".