51661360 has 40 divisors (see below), whose sum is σ = 120523536. Its totient is φ = 20593920.

The previous prime is 51661349. The next prime is 51661373. The reversal of 51661360 is 6316615.

It is a tau number, because it is divible by the number of its divisors (40).

It is a super-2 number, since 2×51661360² = 5337792234099200, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 26830 + ... + 28690.

Almost surely, 2^51661360 is an apocalyptic number.

It is an amenable number.

51661360 is an abundant number, since it is smaller than the sum of its proper divisors (68862176).

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

51661360 is a wasteful number, since it uses less digits than its factorization.

51661360 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2221 (or 2215 counting only the distinct ones).

The product of its (nonzero) digits is 3240, while the sum is 28.

The square root of 51661360 is about 7187.5837386426. The cubic root of 51661360 is about 372.4391084048.

Adding to 51661360 its reverse (6316615), we get a palindrome (57977975).

The spelling of 51661360 in words is "fifty-one million, six hundred sixty-one thousand, three hundred sixty".