51640198 has 16 divisors (see below), whose sum is σ = 80981856. Its totient is φ = 24650560.

The previous prime is 51640177. The next prime is 51640207. The reversal of 51640198 is 89104615.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 42690 + ... + 43882.

It is an arithmetic number, because the mean of its divisors is an integer number (5061366).

Almost surely, 2^51640198 is an apocalyptic number.

51640198 is a deficient number, since it is larger than the sum of its proper divisors (29341658).

51640198 is a wasteful number, since it uses less digits than its factorization.

51640198 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2159.

The product of its (nonzero) digits is 8640, while the sum is 34.

The square root of 51640198 is about 7186.1114658764. Note that the first 3 decimals coincide. The cubic root of 51640198 is about 372.3882474852.

The spelling of 51640198 in words is "fifty-one million, six hundred forty thousand, one hundred ninety-eight".