61041540 has 192 divisors, whose sum is σ = 209018880. Its totient is φ = 13009920.

The previous prime is 61041523. The next prime is 61041551. The reversal of 61041540 is 4514016.

61041540 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 (21).

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 63 ways as a sum of consecutive naturals, for example, 685816 + ... + 685904.

It is an arithmetic number, because the mean of its divisors is an integer number (1088640).

Almost surely, 2^61041540 is an apocalyptic number.

61041540 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 61041540, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (104509440).

61041540 is an abundant number, since it is smaller than the sum of its proper divisors (147977340).

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

61041540 is a wasteful number, since it uses less digits than its factorization.

61041540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 202 (or 200 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 21.

The square root of 61041540 is about 7812.9085493176. The cubic root of 61041540 is about 393.7390543695.

Adding to 61041540 its reverse (4514016), we get a palindrome (65555556).

The spelling of 61041540 in words is "sixty-one million, forty-one thousand, five hundred forty".