51002540 has 24 divisors (see below), whose sum is σ = 107276400. Its totient is φ = 20368448.

The previous prime is 51002531. The next prime is 51002557. The reversal of 51002540 is 4520015.

It is a super-3 number, since 3×51002540³ (a number of 24 digits) contains 333 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13811 + ... + 17109.

It is an arithmetic number, because the mean of its divisors is an integer number (4469850).

Almost surely, 2^51002540 is an apocalyptic number.

It is an amenable number.

51002540 is an abundant number, since it is smaller than the sum of its proper divisors (56273860).

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

51002540 is a wasteful number, since it uses less digits than its factorization.

51002540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4081 (or 4079 counting only the distinct ones).

The product of its (nonzero) digits is 200, while the sum is 17.

The square root of 51002540 is about 7141.6062618993. The cubic root of 51002540 is about 370.8491333026.

Adding to 51002540 its reverse (4520015), we get a palindrome (55522555).

The spelling of 51002540 in words is "fifty-one million, two thousand, five hundred forty".