51229808 has 40 divisors (see below), whose sum is σ = 115147392. Its totient is φ = 21624768.

The previous prime is 51229807. The next prime is 51229811. The reversal of 51229808 is 80892215.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51229807) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4091 + ... + 10917.

Almost surely, 2^51229808 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 51229808, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (57573696).

51229808 is an abundant number, since it is smaller than the sum of its proper divisors (63917584).

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

51229808 is a wasteful number, since it uses less digits than its factorization.

51229808 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6909 (or 6903 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 35.

The square root of 51229808 is about 7157.5001222494. The cubic root of 51229808 is about 371.3991533759.

The spelling of 51229808 in words is "fifty-one million, two hundred twenty-nine thousand, eight hundred eight".