61515252 has 72 divisors (see below), whose sum is σ = 161808192. Its totient is φ = 19689600.

The previous prime is 61515247. The next prime is 61515281. The reversal of 61515252 is 25251516.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 104503 + ... + 105089.

It is an arithmetic number, because the mean of its divisors is an integer number (2247336).

Almost surely, 2^61515252 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 61515252, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (80904096).

61515252 is an abundant number, since it is smaller than the sum of its proper divisors (100292940).

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

61515252 is a wasteful number, since it uses less digits than its factorization.

61515252 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 709 (or 704 counting only the distinct ones).

The product of its digits is 3000, while the sum is 27.

The square root of 61515252 is about 7843.1659423985. The cubic root of 61515252 is about 394.7549663313.

Adding to 61515252 its reverse (25251516), we get a palindrome (86766768).

The spelling of 61515252 in words is "sixty-one million, five hundred fifteen thousand, two hundred fifty-two".