51643926 has 64 divisors (see below), whose sum is σ = 122938560. Its totient is φ = 16012800.

The previous prime is 51643877. The next prime is 51643927. The reversal of 51643926 is 62934615.

It is a happy number.

51643926 is a `hidden beast` number, since 5 + 1 + 643 + 9 + 2 + 6 = 666.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51643927) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 92440 + ... + 92996.

It is an arithmetic number, because the mean of its divisors is an integer number (1920915).

Almost surely, 2^51643926 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 51643926, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (61469280).

51643926 is an abundant number, since it is smaller than the sum of its proper divisors (71294634).

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

51643926 is a wasteful number, since it uses less digits than its factorization.

51643926 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 686 (or 680 counting only the distinct ones).

The product of its digits is 38880, while the sum is 36.

The square root of 51643926 is about 7186.3708504363. The cubic root of 51643926 is about 372.3972083983.

The spelling of 51643926 in words is "fifty-one million, six hundred forty-three thousand, nine hundred twenty-six".