61651140 has 24 divisors (see below), whose sum is σ = 172623360. Its totient is φ = 16440288.

The previous prime is 61651133. The next prime is 61651193. The reversal of 61651140 is 4115616.

61651140 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a self number, because there is not a number n which added to its sum of digits gives 61651140.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 513700 + ... + 513819.

It is an arithmetic number, because the mean of its divisors is an integer number (7192640).

Almost surely, 2^61651140 is an apocalyptic number.

61651140 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

61651140 is an abundant number, since it is smaller than the sum of its proper divisors (110972220).

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

61651140 is a wasteful number, since it uses less digits than its factorization.

61651140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1027531 (or 1027529 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 24.

The square root of 61651140 is about 7851.8239919142. The cubic root of 61651140 is about 395.0454255294.

Adding to 61651140 its reverse (4115616), we get a palindrome (65766756).

The spelling of 61651140 in words is "sixty-one million, six hundred fifty-one thousand, one hundred forty".