51988615 has 16 divisors (see below), whose sum is σ = 73039680. Its totient is φ = 34778880.

The previous prime is 51988613. The next prime is 51988621. The reversal of 51988615 is 51688915.

It is not a de Polignac number, because 51988615 - 2¹ = 51988613 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51988613) 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 15 ways as a sum of consecutive naturals, for example, 16680 + ... + 19549.

It is an arithmetic number, because the mean of its divisors is an integer number (4564980).

Almost surely, 2^51988615 is an apocalyptic number.

51988615 is a deficient number, since it is larger than the sum of its proper divisors (21051065).

51988615 is a wasteful number, since it uses less digits than its factorization.

51988615 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36282.

The product of its digits is 86400, while the sum is 43.

The square root of 51988615 is about 7210.3130999978. The cubic root of 51988615 is about 373.2238735399.

The spelling of 51988615 in words is "fifty-one million, nine hundred eighty-eight thousand, six hundred fifteen".