61643160 has 64 divisors (see below), whose sum is σ = 205480800. Its totient is φ = 16437888.

The previous prime is 61643129. The next prime is 61643161. The reversal of 61643160 is 6134616.

61643160 = 838² + 839² + ... + 917².

61643160 is a `hidden beast` number, since 6 + 1 + 643 + 16 + 0 = 666.

61643160 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61643161) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 27459 + ... + 29618.

Almost surely, 2^61643160 is an apocalyptic number.

61643160 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

61643160 is an abundant number, since it is smaller than the sum of its proper divisors (143837640).

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

61643160 is a wasteful number, since it uses less digits than its factorization.

61643160 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57097 (or 57087 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 27.

The square root of 61643160 is about 7851.3158132889. The cubic root of 61643160 is about 395.0283801646.

Adding to 61643160 its reverse (6134616), we get a palindrome (67777776).

The spelling of 61643160 in words is "sixty-one million, six hundred forty-three thousand, one hundred sixty".