51429420 has 216 divisors, whose sum is σ = 192707424. Its totient is φ = 11063808.

The previous prime is 51429407. The next prime is 51429431. The reversal of 51429420 is 2492415.

It is an unprimeable number.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 3025252 + ... + 3025268.

It is an arithmetic number, because the mean of its divisors is an integer number (892164).

Almost surely, 2^51429420 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 51429420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (96353712).

51429420 is an abundant number, since it is smaller than the sum of its proper divisors (141278004).

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

51429420 is a wasteful number, since it uses less digits than its factorization.

51429420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 67 (or 34 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 27.

The square root of 51429420 is about 7171.4308195785. The cubic root of 51429420 is about 371.8809018671.

The spelling of 51429420 in words is "fifty-one million, four hundred twenty-nine thousand, four hundred twenty".