51640699 has 16 divisors (see below), whose sum is σ = 58521600. Its totient is φ = 45144000.

The previous prime is 51640697. The next prime is 51640717. The reversal of 51640699 is 99604615.

It is not a de Polignac number, because 51640699 - 2¹ = 51640697 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51640697) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 67479 + ... + 68239.

It is an arithmetic number, because the mean of its divisors is an integer number (3657600).

Almost surely, 2^51640699 is an apocalyptic number.

51640699 is a deficient number, since it is larger than the sum of its proper divisors (6880901).

51640699 is a wasteful number, since it uses less digits than its factorization.

51640699 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1002.

The product of its (nonzero) digits is 58320, while the sum is 40.

The square root of 51640699 is about 7186.1463247000. The cubic root of 51640699 is about 372.3894517532.

The spelling of 51640699 in words is "fifty-one million, six hundred forty thousand, six hundred ninety-nine".