61116440 has 64 divisors (see below), whose sum is σ = 171452160. Its totient is φ = 19048320.

The previous prime is 61116431. The next prime is 61116457. The reversal of 61116440 is 4461116.

It is a super-4 number, since 4×61116440⁴ (a number of 32 digits) contains 4444 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6842 + ... + 13001.

It is an arithmetic number, because the mean of its divisors is an integer number (2678940).

Almost surely, 2^61116440 is an apocalyptic number.

It is an amenable number.

61116440 is an abundant number, since it is smaller than the sum of its proper divisors (110335720).

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

61116440 is a wasteful number, since it uses less digits than its factorization.

61116440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19872 (or 19868 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 23.

The square root of 61116440 is about 7817.7004291543. The cubic root of 61116440 is about 393.9000321846.

Adding to 61116440 its reverse (4461116), we get a palindrome (65577556).

The spelling of 61116440 in words is "sixty-one million, one hundred sixteen thousand, four hundred forty".