51649598 has 32 divisors (see below), whose sum is σ = 104025600. Its totient is φ = 18574560.

The previous prime is 51649597. The next prime is 51649601. The reversal of 51649598 is 89594615.

It is a happy number.

It is a Smith number, since the sum of its digits (47) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51649597) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10898 + ... + 14901.

It is an arithmetic number, because the mean of its divisors is an integer number (3250800).

Almost surely, 2^51649598 is an apocalyptic number.

51649598 is an abundant number, since it is smaller than the sum of its proper divisors (52376002).

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

51649598 is a wasteful number, since it uses less digits than its factorization.

51649598 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25832.

The product of its digits is 388800, while the sum is 47.

The square root of 51649598 is about 7186.7654755112. The cubic root of 51649598 is about 372.4108412351.

The spelling of 51649598 in words is "fifty-one million, six hundred forty-nine thousand, five hundred ninety-eight".