61616140 has 12 divisors (see below), whose sum is σ = 129393936. Its totient is φ = 24646448.

The previous prime is 61616131. The next prime is 61616141. The reversal of 61616140 is 4161616.

It is not an unprimeable number, because it can be changed into a prime (61616141) 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, 1540384 + ... + 1540423.

It is an arithmetic number, because the mean of its divisors is an integer number (10782828).

Almost surely, 2^61616140 is an apocalyptic number.

It is an amenable number.

61616140 is an abundant number, since it is smaller than the sum of its proper divisors (67777796).

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

61616140 is a wasteful number, since it uses less digits than its factorization.

61616140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3080816 (or 3080814 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 25.

The square root of 61616140 is about 7849.5948940057. The cubic root of 61616140 is about 394.9706542318.

Adding to 61616140 its reverse (4161616), we get a palindrome (65777756).

The spelling of 61616140 in words is "sixty-one million, six hundred sixteen thousand, one hundred forty".