51515040 has 48 divisors (see below), whose sum is σ = 162273888. Its totient is φ = 13737216.

The previous prime is 51515033. The next prime is 51515047. The reversal of 51515040 is 4051515.

It is an interprime number because it is at equal distance from previous prime (51515033) and next prime (51515047).

It is a tau number, because it is divible by the number of its divisors (48).

It is a junction number, because it is equal to n+sod(n) for n = 51514998 and 51515016.

It is not an unprimeable number, because it can be changed into a prime (51515047) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 53182 + ... + 54141.

It is an arithmetic number, because the mean of its divisors is an integer number (3380706).

Almost surely, 2^51515040 is an apocalyptic number.

It is an amenable number.

51515040 is an abundant number, since it is smaller than the sum of its proper divisors (110758848).

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

51515040 is a wasteful number, since it uses less digits than its factorization.

51515040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 107341 (or 107333 counting only the distinct ones).

The product of its (nonzero) digits is 500, while the sum is 21.

The square root of 51515040 is about 7177.3978571624. The cubic root of 51515040 is about 372.0871572864.

Adding to 51515040 its reverse (4051515), we get a palindrome (55566555).

The spelling of 51515040 in words is "fifty-one million, five hundred fifteen thousand, forty".