51951840 has 48 divisors (see below), whose sum is σ = 163649808. Its totient is φ = 13853696.

The previous prime is 51951829. The next prime is 51951853. The reversal of 51951840 is 4815915.

It is a tau number, because it is divible by the number of its divisors (48).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 53637 + ... + 54596.

It is an arithmetic number, because the mean of its divisors is an integer number (3409371).

Almost surely, 2^51951840 is an apocalyptic number.

It is an amenable number.

51951840 is an abundant number, since it is smaller than the sum of its proper divisors (111697968).

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

51951840 is a wasteful number, since it uses less digits than its factorization.

51951840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 108251 (or 108243 counting only the distinct ones).

The product of its (nonzero) digits is 7200, while the sum is 33.

The square root of 51951840 is about 7207.7624822132. The cubic root of 51951840 is about 373.1358507713.

The spelling of 51951840 in words is "fifty-one million, nine hundred fifty-one thousand, eight hundred forty".