51644407 has 8 divisors (see below), whose sum is σ = 54105696. Its totient is φ = 49201152.

The previous prime is 51644393. The next prime is 51644441. The reversal of 51644407 is 70444615.

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

It is a cyclic number.

It is not a de Polignac number, because 51644407 - 2⁷ = 51644279 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51644107) 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, 1543 + ... + 10279.

It is an arithmetic number, because the mean of its divisors is an integer number (6763212).

Almost surely, 2^51644407 is an apocalyptic number.

51644407 is a deficient number, since it is larger than the sum of its proper divisors (2461289).

51644407 is a wasteful number, since it uses less digits than its factorization.

51644407 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9017.

The product of its (nonzero) digits is 13440, while the sum is 31.

The square root of 51644407 is about 7186.4043164854. The cubic root of 51644407 is about 372.3983645362.

The spelling of 51644407 in words is "fifty-one million, six hundred forty-four thousand, four hundred seven".