51409428 has 144 divisors (see below), whose sum is σ = 152832960. Its totient is φ = 13353984.

The previous prime is 51409409. The next prime is 51409433. The reversal of 51409428 is 82490415.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 369783 + ... + 369921.

It is an arithmetic number, because the mean of its divisors is an integer number (1061340).

Almost surely, 2^51409428 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 51409428, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (76416480).

51409428 is an abundant number, since it is smaller than the sum of its proper divisors (101423532).

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

51409428 is a wasteful number, since it uses less digits than its factorization.

51409428 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 214 (or 205 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 33.

The square root of 51409428 is about 7170.0368199891. The cubic root of 51409428 is about 371.8327089162.

The spelling of 51409428 in words is "fifty-one million, four hundred nine thousand, four hundred twenty-eight".