51387258 has 32 divisors (see below), whose sum is σ = 112343616. Its totient is φ = 15573888.

The previous prime is 51387257. The next prime is 51387293. The reversal of 51387258 is 85278315.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is not an unprimeable number, because it can be changed into a prime (51387251) 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, 310 + ... + 10142.

It is an arithmetic number, because the mean of its divisors is an integer number (3510738).

Almost surely, 2^51387258 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 51387258, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (56171808).

51387258 is an abundant number, since it is smaller than the sum of its proper divisors (60956358).

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

51387258 is a wasteful number, since it uses less digits than its factorization.

51387258 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9918.

The product of its digits is 67200, while the sum is 39.

The square root of 51387258 is about 7168.4906361102. The cubic root of 51387258 is about 371.7792510405.

The spelling of 51387258 in words is "fifty-one million, three hundred eighty-seven thousand, two hundred fifty-eight".