51402816 has 112 divisors (see below), whose sum is σ = 152887680. Its totient is φ = 16934400.

The previous prime is 51402803. The next prime is 51402821. The reversal of 51402816 is 61820415.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a self number, because there is not a number n which added to its sum of digits gives 51402816.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 260830 + ... + 261026.

Almost surely, 2^51402816 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 51402816, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (76443840).

51402816 is an abundant number, since it is smaller than the sum of its proper divisors (101484864).

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

51402816 is a wasteful number, since it uses less digits than its factorization.

51402816 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 369 (or 353 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 27.

The square root of 51402816 is about 7169.5757196643. The cubic root of 51402816 is about 371.8167672016.

The spelling of 51402816 in words is "fifty-one million, four hundred two thousand, eight hundred sixteen".