51428718 has 48 divisors (see below), whose sum is σ = 122234112. Its totient is φ = 15498000.

The previous prime is 51428693. The next prime is 51428743. The reversal of 51428718 is 81782415.

It is an interprime number because it is at equal distance from previous prime (51428693) and next prime (51428743).

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 41163 + ... + 42393.

It is an arithmetic number, because the mean of its divisors is an integer number (2546544).

Almost surely, 2^51428718 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 51428718, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (61117056).

51428718 is an abundant number, since it is smaller than the sum of its proper divisors (70805394).

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

51428718 is a wasteful number, since it uses less digits than its factorization.

51428718 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1461 (or 1458 counting only the distinct ones).

The product of its digits is 17920, while the sum is 36.

The square root of 51428718 is about 7171.3818752037. The cubic root of 51428718 is about 371.8792098292.

The spelling of 51428718 in words is "fifty-one million, four hundred twenty-eight thousand, seven hundred eighteen".