51135678 has 64 divisors (see below), whose sum is σ = 128010240. Its totient is φ = 14990400.

The previous prime is 51135659. The next prime is 51135683. The reversal of 51135678 is 87653115.

It is a super-2 number, since 2×51135678² = 5229715129039368, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 17026 + ... + 19802.

It is an arithmetic number, because the mean of its divisors is an integer number (2000160).

Almost surely, 2^51135678 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 51135678, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (64005120).

51135678 is an abundant number, since it is smaller than the sum of its proper divisors (76874562).

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

51135678 is a wasteful number, since it uses less digits than its factorization.

51135678 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2830 (or 2824 counting only the distinct ones).

The product of its digits is 25200, while the sum is 36.

The square root of 51135678 is about 7150.9214790823. The cubic root of 51135678 is about 371.1715434658.

The spelling of 51135678 in words is "fifty-one million, one hundred thirty-five thousand, six hundred seventy-eight".