51649434 has 32 divisors (see below), whose sum is σ = 121530240. Its totient is φ = 16203456.

The previous prime is 51649397. The next prime is 51649439. The reversal of 51649434 is 43494615.

51649434 is a `hidden beast` number, since 5 + 1 + 649 + 4 + 3 + 4 = 666.

It is not an unprimeable number, because it can be changed into a prime (51649439) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 27214 + ... + 29049.

It is an arithmetic number, because the mean of its divisors is an integer number (3797820).

Almost surely, 2^51649434 is an apocalyptic number.

51649434 is a gapful number since it is divisible by the number (54) formed by its first and last digit.

51649434 is an abundant number, since it is smaller than the sum of its proper divisors (69880806).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

51649434 is a wasteful number, since it uses less digits than its factorization.

51649434 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56291 (or 56285 counting only the distinct ones).

The product of its digits is 51840, while the sum is 36.

The square root of 51649434 is about 7186.7540656405. The cubic root of 51649434 is about 372.4104470698.

The spelling of 51649434 in words is "fifty-one million, six hundred forty-nine thousand, four hundred thirty-four".