51006402 has 16 divisors (see below), whose sum is σ = 113347680. Its totient is φ = 17002116.

The previous prime is 51006401. The next prime is 51006407. The reversal of 51006402 is 20460015.

It is a happy number.

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 (51006401) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 472228 + ... + 472335.

It is an arithmetic number, because the mean of its divisors is an integer number (7084230).

Almost surely, 2^51006402 is an apocalyptic number.

51006402 is an abundant number, since it is smaller than the sum of its proper divisors (62341278).

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

51006402 is a wasteful number, since it uses less digits than its factorization.

51006402 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 944574 (or 944568 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 18.

The square root of 51006402 is about 7141.8766441321. The cubic root of 51006402 is about 370.8584935110.

Adding to 51006402 its reverse (20460015), we get a palindrome (71466417).

The spelling of 51006402 in words is "fifty-one million, six thousand, four hundred two".