61042540 has 48 divisors (see below), whose sum is σ = 138636288. Its totient is φ = 22443264.

The previous prime is 61042523. The next prime is 61042547. The reversal of 61042540 is 4524016.

It is not an unprimeable number, because it can be changed into a prime (61042547) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 99274 + ... + 99886.

It is an arithmetic number, because the mean of its divisors is an integer number (2888256).

Almost surely, 2^61042540 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 61042540, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (69318144).

61042540 is an abundant number, since it is smaller than the sum of its proper divisors (77593748).

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

61042540 is a wasteful number, since it uses less digits than its factorization.

61042540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1018 (or 1016 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 22.

The square root of 61042540 is about 7812.9725457088. The cubic root of 61042540 is about 393.7412044731.

Adding to 61042540 its reverse (4524016), we get a palindrome (65566556).

The spelling of 61042540 in words is "sixty-one million, forty-two thousand, five hundred forty".