51820002 has 24 divisors (see below), whose sum is σ = 120913884. Its totient is φ = 15944544.

The previous prime is 51820001. The next prime is 51820007. The reversal of 51820002 is 20002815.

It can be written as a sum of positive squares in 2 ways, for example, as 51538041 + 281961 = 7179^2 + 531^2 .

It is a Harshad number since it is a multiple of its sum of digits (18).

It is not an unprimeable number, because it can be changed into a prime (51820001) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 110493 + ... + 110960.

Almost surely, 2^51820002 is an apocalyptic number.

51820002 is an abundant number, since it is smaller than the sum of its proper divisors (69093882).

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

51820002 is a wasteful number, since it uses less digits than its factorization.

51820002 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 221474 (or 221471 counting only the distinct ones).

The product of its (nonzero) digits is 160, while the sum is 18.

The square root of 51820002 is about 7198.6111160418. The cubic root of 51820002 is about 372.8199482240.

Adding to 51820002 its reverse (20002815), we get a palindrome (71822817).

The spelling of 51820002 in words is "fifty-one million, eight hundred twenty thousand, two".