51320844 has 72 divisors (see below), whose sum is σ = 136750320. Its totient is φ = 16644096.

The previous prime is 51320839. The next prime is 51320869. The reversal of 51320844 is 44802315.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a zygodrome in base 2.

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, 199564 + ... + 199820.

It is an arithmetic number, because the mean of its divisors is an integer number (1899310).

Almost surely, 2^51320844 is an apocalyptic number.

51320844 is a gapful number since it is divisible by the number (54) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 51320844, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (68375160).

51320844 is an abundant number, since it is smaller than the sum of its proper divisors (85429476).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

51320844 is a wasteful number, since it uses less digits than its factorization.

51320844 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 356 (or 305 counting only the distinct ones).

The product of its (nonzero) digits is 3840, while the sum is 27.

The square root of 51320844 is about 7163.8567824880. The cubic root of 51320844 is about 371.6190168178.

The spelling of 51320844 in words is "fifty-one million, three hundred twenty thousand, eight hundred forty-four".