51640045 has 16 divisors (see below), whose sum is σ = 63414720. Its totient is φ = 40356864.

The previous prime is 51640031. The next prime is 51640051. The reversal of 51640045 is 54004615.

It is a cyclic number.

It is not a de Polignac number, because 51640045 - 2¹¹ = 51637997 is a prime.

It is a congruent number.

It is an unprimeable number.

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, 56482 + ... + 57388.

It is an arithmetic number, because the mean of its divisors is an integer number (3963420).

Almost surely, 2^51640045 is an apocalyptic number.

It is an amenable number.

51640045 is a deficient number, since it is larger than the sum of its proper divisors (11774675).

51640045 is a wasteful number, since it uses less digits than its factorization.

51640045 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1164.

The product of its (nonzero) digits is 2400, while the sum is 25.

The square root of 51640045 is about 7186.1008203337. The cubic root of 51640045 is about 372.3878797132.

The spelling of 51640045 in words is "fifty-one million, six hundred forty thousand, forty-five".