61565680 has 80 divisors (see below), whose sum is σ = 159882624. Its totient is φ = 21853440.

The previous prime is 61565657. The next prime is 61565711. The reversal of 61565680 is 8656516.

It is a tau number, because it is divible by the number of its divisors (80).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 37027 + ... + 38653.

Almost surely, 2^61565680 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 61565680, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (79941312).

61565680 is an abundant number, since it is smaller than the sum of its proper divisors (98316944).

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

61565680 is a wasteful number, since it uses less digits than its factorization.

61565680 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1694 (or 1688 counting only the distinct ones).

The product of its (nonzero) digits is 43200, while the sum is 37.

The square root of 61565680 is about 7846.3800570709. The cubic root of 61565680 is about 394.8628055293.

The spelling of 61565680 in words is "sixty-one million, five hundred sixty-five thousand, six hundred eighty".