51640615 has 8 divisors (see below), whose sum is σ = 66735648. Its totient is φ = 38134560.

The previous prime is 51640601. The next prime is 51640621. The reversal of 51640615 is 51604615.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 51640615 - 2⁷ = 51640487 is a prime.

It is a Duffinian number.

It is a congruent number.

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, 397171 + ... + 397300.

It is an arithmetic number, because the mean of its divisors is an integer number (8341956).

Almost surely, 2^51640615 is an apocalyptic number.

51640615 is a deficient number, since it is larger than the sum of its proper divisors (15095033).

51640615 is a wasteful number, since it uses less digits than its factorization.

51640615 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 794489.

The product of its (nonzero) digits is 3600, while the sum is 28.

The square root of 51640615 is about 7186.1404801187. The cubic root of 51640615 is about 372.3892498405.

The spelling of 51640615 in words is "fifty-one million, six hundred forty thousand, six hundred fifteen".