51423664 has 10 divisors (see below), whose sum is σ = 99633380. Its totient is φ = 25711824.

The previous prime is 51423661. The next prime is 51423703. The reversal of 51423664 is 46632415.

It is not an unprimeable number, because it can be changed into a prime (51423661) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1606974 + ... + 1607005.

It is an arithmetic number, because the mean of its divisors is an integer number (9963338).

Almost surely, 2^51423664 is an apocalyptic number.

It is an amenable number.

51423664 is a deficient number, since it is larger than the sum of its proper divisors (48209716).

51423664 is a wasteful number, since it uses less digits than its factorization.

51423664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3213987 (or 3213981 counting only the distinct ones).

The product of its digits is 17280, while the sum is 31.

The square root of 51423664 is about 7171.0294937338. The cubic root of 51423664 is about 371.8670276661.

The spelling of 51423664 in words is "fifty-one million, four hundred twenty-three thousand, six hundred sixty-four".