61015240 has 64 divisors (see below), whose sum is σ = 161300160. Its totient is φ = 20478720.

The previous prime is 61015219. The next prime is 61015247. The reversal of 61015240 is 4251016.

It is not an unprimeable number, because it can be changed into a prime (61015247) 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, 387 + ... + 11053.

It is an arithmetic number, because the mean of its divisors is an integer number (2520315).

Almost surely, 2^61015240 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 61015240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (80650080).

61015240 is an abundant number, since it is smaller than the sum of its proper divisors (100284920).

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

61015240 is a wasteful number, since it uses less digits than its factorization.

61015240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10702 (or 10698 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 19.

The square root of 61015240 is about 7811.2252560018. The cubic root of 61015240 is about 393.6824982128.

Adding to 61015240 its reverse (4251016), we get a palindrome (65266256).

The spelling of 61015240 in words is "sixty-one million, fifteen thousand, two hundred forty".