51609798 has 48 divisors (see below), whose sum is σ = 117202176. Its totient is φ = 17019720.

The previous prime is 51609793. The next prime is 51609839. The reversal of 51609798 is 89790615.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51609793) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 49543 + ... + 50573.

It is an arithmetic number, because the mean of its divisors is an integer number (2441712).

Almost surely, 2^51609798 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 51609798, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (58601088).

51609798 is an abundant number, since it is smaller than the sum of its proper divisors (65592378).

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

51609798 is a wasteful number, since it uses less digits than its factorization.

51609798 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1151 (or 1139 counting only the distinct ones).

The product of its (nonzero) digits is 136080, while the sum is 45.

The square root of 51609798 is about 7183.9959632505. The cubic root of 51609798 is about 372.3151595594.

The spelling of 51609798 in words is "fifty-one million, six hundred nine thousand, seven hundred ninety-eight".