61318656 has 120 divisors (see below), whose sum is σ = 202357584. Its totient is φ = 17510400.

The previous prime is 61318633. The next prime is 61318661. The reversal of 61318656 is 65681316.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 61318656.

It is a congruent number.

It is an unprimeable number.

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 11 ways as a sum of consecutive naturals, for example, 31306 + ... + 33206.

Almost surely, 2^61318656 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 61318656, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (101178792).

61318656 is an abundant number, since it is smaller than the sum of its proper divisors (141038928).

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

61318656 is a wasteful number, since it uses less digits than its factorization.

61318656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1932 (or 1913 counting only the distinct ones).

The product of its digits is 25920, while the sum is 36.

The square root of 61318656 is about 7830.6229637239. The cubic root of 61318656 is about 394.3339863484. Note that the first 3 decimals are identical.

The spelling of 61318656 in words is "sixty-one million, three hundred eighteen thousand, six hundred fifty-six".