61215580 has 24 divisors (see below), whose sum is σ = 128720592. Its totient is φ = 24454272.

The previous prime is 61215577. The next prime is 61215613. The reversal of 61215580 is 8551216.

61215580 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

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 7 ways as a sum of consecutive naturals, for example, 19179 + ... + 22141.

It is an arithmetic number, because the mean of its divisors is an integer number (5363358).

Almost surely, 2^61215580 is an apocalyptic number.

It is an amenable number.

61215580 is an abundant number, since it is smaller than the sum of its proper divisors (67505012).

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

61215580 is a wasteful number, since it uses less digits than its factorization.

61215580 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4005 (or 4003 counting only the distinct ones).

The product of its (nonzero) digits is 2400, while the sum is 28.

The square root of 61215580 is about 7824.0385990868. The cubic root of 61215580 is about 394.1129053632.

Adding to 61215580 its reverse (8551216), we get a palindrome (69766796).

The spelling of 61215580 in words is "sixty-one million, two hundred fifteen thousand, five hundred eighty".