51920838 has 56 divisors (see below), whose sum is σ = 118044000. Its totient is φ = 17118864.

The previous prime is 51920833. The next prime is 51920917. The reversal of 51920838 is 83802915.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51920833) by changing a digit.

It is a polite number, since it can be written in 27 ways as a sum of consecutive naturals, for example, 217123 + ... + 217361.

Almost surely, 2^51920838 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 51920838, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (59022000).

51920838 is an abundant number, since it is smaller than the sum of its proper divisors (66123162).

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

51920838 is a wasteful number, since it uses less digits than its factorization.

51920838 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 408 (or 393 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 36.

The square root of 51920838 is about 7205.6115632193. The cubic root of 51920838 is about 373.0616136865.

The spelling of 51920838 in words is "fifty-one million, nine hundred twenty thousand, eight hundred thirty-eight".