51698628 has 48 divisors (see below), whose sum is σ = 134856960. Its totient is φ = 17127072.

The previous prime is 51698609. The next prime is 51698701. The reversal of 51698628 is 82689615.

51698628 is a `hidden beast` number, since 5 + 16 + 9 + 8 + 628 = 666.

51698628 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

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, 17301 + ... + 20067.

It is an arithmetic number, because the mean of its divisors is an integer number (2809520).

Almost surely, 2^51698628 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 51698628, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (67428480).

51698628 is an abundant number, since it is smaller than the sum of its proper divisors (83158332).

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

51698628 is a wasteful number, since it uses less digits than its factorization.

51698628 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2953 (or 2945 counting only the distinct ones).

The product of its digits is 207360, while the sum is 45.

The square root of 51698628 is about 7190.1757975727. The cubic root of 51698628 is about 372.5286448551.

It can be divided in two parts, 51698 and 628, that added together give a triangular number (52326 = T₃₂₃).

The spelling of 51698628 in words is "fifty-one million, six hundred ninety-eight thousand, six hundred twenty-eight".