61215288 has 64 divisors (see below), whose sum is σ = 159386400. Its totient is φ = 19568640.

The previous prime is 61215281. The next prime is 61215289. The reversal of 61215288 is 88251216.

It is a super-2 number, since 2×61215288² = 7494622969845888, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61215281) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 195420 + ... + 195732.

Almost surely, 2^61215288 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 61215288, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (79693200).

61215288 is an abundant number, since it is smaller than the sum of its proper divisors (98171112).

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

61215288 is a wasteful number, since it uses less digits than its factorization.

61215288 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 632 (or 628 counting only the distinct ones).

The product of its digits is 7680, while the sum is 33.

The square root of 61215288 is about 7824.0199386249. The cubic root of 61215288 is about 394.1122787190.

The spelling of 61215288 in words is "sixty-one million, two hundred fifteen thousand, two hundred eighty-eight".