51649870 has 16 divisors (see below), whose sum is σ = 96176160. Its totient is φ = 19947424.

The previous prime is 51649867. The next prime is 51649877. The reversal of 51649870 is 7894615.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51649877) 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, 88762 + ... + 89341.

It is an arithmetic number, because the mean of its divisors is an integer number (6011010).

Almost surely, 2^51649870 is an apocalyptic number.

51649870 is a deficient number, since it is larger than the sum of its proper divisors (44526290).

51649870 is a wasteful number, since it uses less digits than its factorization.

51649870 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 178139.

The product of its (nonzero) digits is 60480, while the sum is 40.

The square root of 51649870 is about 7186.7843991593. The cubic root of 51649870 is about 372.4114949709.

The spelling of 51649870 in words is "fifty-one million, six hundred forty-nine thousand, eight hundred seventy".