51431768 has 8 divisors (see below), whose sum is σ = 96434580. Its totient is φ = 25715880.

The previous prime is 51431719. The next prime is 51431789. The reversal of 51431768 is 86713415.

It is a tau number, because it is divible by the number of its divisors (8).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3214478 + ... + 3214493.

Almost surely, 2^51431768 is an apocalyptic number.

It is an amenable number.

51431768 is a deficient number, since it is larger than the sum of its proper divisors (45002812).

51431768 is a wasteful number, since it uses less digits than its factorization.

51431768 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6428977 (or 6428973 counting only the distinct ones).

The product of its digits is 20160, while the sum is 35.

The square root of 51431768 is about 7171.5945228380. The cubic root of 51431768 is about 371.8865611640.

The spelling of 51431768 in words is "fifty-one million, four hundred thirty-one thousand, seven hundred sixty-eight".