51664442 has 8 divisors (see below), whose sum is σ = 77530656. Its totient is φ = 25820892.

The previous prime is 51664433. The next prime is 51664447. The reversal of 51664442 is 24446615.

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

It is a junction number, because it is equal to n+sod(n) for n = 51664399 and 51664408.

It is not an unprimeable number, because it can be changed into a prime (51664447) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2243 + ... + 10409.

It is an arithmetic number, because the mean of its divisors is an integer number (9691332).

Almost surely, 2^51664442 is an apocalyptic number.

51664442 is a deficient number, since it is larger than the sum of its proper divisors (25866214).

51664442 is a wasteful number, since it uses less digits than its factorization.

51664442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11332.

The product of its digits is 23040, while the sum is 32.

The square root of 51664442 is about 7187.7981329473. The cubic root of 51664442 is about 372.4465145494.

The spelling of 51664442 in words is "fifty-one million, six hundred sixty-four thousand, four hundred forty-two".