61709568 has 72 divisors (see below), whose sum is σ = 172922400. Its totient is φ = 19482624.

The previous prime is 61709537. The next prime is 61709569. The reversal of 61709568 is 86590716.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61709569) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12478 + ... + 16706.

It is an arithmetic number, because the mean of its divisors is an integer number (2401700).

Almost surely, 2^61709568 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 61709568, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (86461200).

61709568 is an abundant number, since it is smaller than the sum of its proper divisors (111212832).

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

61709568 is a wasteful number, since it uses less digits than its factorization.

61709568 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4267 (or 4253 counting only the distinct ones).

The product of its (nonzero) digits is 90720, while the sum is 42.

The square root of 61709568 is about 7855.5437749401. The cubic root of 61709568 is about 395.1701835701.

The spelling of 61709568 in words is "sixty-one million, seven hundred nine thousand, five hundred sixty-eight".