51445002 has 48 divisors (see below), whose sum is σ = 120362112. Its totient is φ = 14616000.

The previous prime is 51444973. The next prime is 51445019. The reversal of 51445002 is 20054415.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a self number, because there is not a number n which added to its sum of digits gives 51445002.

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, 68127 + ... + 68877.

It is an arithmetic number, because the mean of its divisors is an integer number (2507544).

Almost surely, 2^51445002 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 51445002, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (60181056).

51445002 is an abundant number, since it is smaller than the sum of its proper divisors (68917110).

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

51445002 is a wasteful number, since it uses less digits than its factorization.

51445002 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1003 (or 996 counting only the distinct ones).

The product of its (nonzero) digits is 800, while the sum is 21.

The square root of 51445002 is about 7172.5171313842. The cubic root of 51445002 is about 371.9184553601.

Adding to 51445002 its reverse (20054415), we get a palindrome (71499417).

The spelling of 51445002 in words is "fifty-one million, four hundred forty-five thousand, two".