51698416 has 80 divisors (see below), whose sum is σ = 129277440. Its totient is φ = 19434240.

The previous prime is 51698407. The next prime is 51698419. The reversal of 51698416 is 61489615.

51698416 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51698419) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 35005 + ... + 36451.

It is an arithmetic number, because the mean of its divisors is an integer number (1615968).

Almost surely, 2^51698416 is an apocalyptic number.

51698416 is a gapful number since it is divisible by the number (56) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 51698416, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (64638720).

51698416 is an abundant number, since it is smaller than the sum of its proper divisors (77579024).

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

51698416 is a wasteful number, since it uses less digits than its factorization.

51698416 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1502 (or 1496 counting only the distinct ones).

The product of its digits is 51840, while the sum is 40.

The square root of 51698416 is about 7190.1610552198. The cubic root of 51698416 is about 372.5281356464.

The spelling of 51698416 in words is "fifty-one million, six hundred ninety-eight thousand, four hundred sixteen".