51667968 has 132 divisors (see below), whose sum is σ = 152460560. Its totient is φ = 15544320.

The previous prime is 51667949. The next prime is 51667969. The reversal of 51667968 is 86976615.

It is a tau number, because it is divible by the number of its divisors (132).

It is a Harshad number since it is a multiple of its sum of digits (48).

It is not an unprimeable number, because it can be changed into a prime (51667969) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 371643 + ... + 371781.

Almost surely, 2^51667968 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 51667968, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (76230280).

51667968 is an abundant number, since it is smaller than the sum of its proper divisors (100792592).

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

51667968 is a wasteful number, since it uses less digits than its factorization.

51667968 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 184 (or 155 counting only the distinct ones).

The product of its digits is 544320, while the sum is 48.

The square root of 51667968 is about 7188.0434055451. The cubic root of 51667968 is about 372.4549872789.

The spelling of 51667968 in words is "fifty-one million, six hundred sixty-seven thousand, nine hundred sixty-eight".