51061664 has 24 divisors (see below), whose sum is σ = 105819840. Its totient is φ = 24186816.

The previous prime is 51061657. The next prime is 51061667. The reversal of 51061664 is 46616015.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51061667) 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, 41384 + ... + 42599.

It is an arithmetic number, because the mean of its divisors is an integer number (4409160).

Almost surely, 2^51061664 is an apocalyptic number.

It is an amenable number.

51061664 is an abundant number, since it is smaller than the sum of its proper divisors (54758176).

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

51061664 is a wasteful number, since it uses less digits than its factorization.

51061664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 84012 (or 84004 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 29.

The square root of 51061664 is about 7145.7444678634. The cubic root of 51061664 is about 370.9923785678.

Adding to 51061664 its reverse (46616015), we get a palindrome (97677679).

The spelling of 51061664 in words is "fifty-one million, sixty-one thousand, six hundred sixty-four".