51698880 has 168 divisors, whose sum is σ = 184251600. Its totient is φ = 13289472.

The previous prime is 51698861. The next prime is 51698939. The reversal of 51698880 is 8889615.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 83211 + ... + 83829.

Almost surely, 2^51698880 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 51698880, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (92125800).

51698880 is an abundant number, since it is smaller than the sum of its proper divisors (132552720).

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

51698880 is a wasteful number, since it uses less digits than its factorization.

51698880 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 671 (or 658 counting only the distinct ones).

The product of its (nonzero) digits is 138240, while the sum is 45.

The square root of 51698880 is about 7190.1933214622. The cubic root of 51698880 is about 372.5292501392.

The spelling of 51698880 in words is "fifty-one million, six hundred ninety-eight thousand, eight hundred eighty".