61705520 has 40 divisors (see below), whose sum is σ = 145209456. Its totient is φ = 24382208.

The previous prime is 61705499. The next prime is 61705537. The reversal of 61705520 is 2550716.

61705520 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (40).

It is a self number, because there is not a number n which added to its sum of digits gives 61705520.

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, 1994 + ... + 11286.

Almost surely, 2^61705520 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 61705520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (72604728).

61705520 is an abundant number, since it is smaller than the sum of its proper divisors (83503936).

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

61705520 is a wasteful number, since it uses less digits than its factorization.

61705520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9389 (or 9383 counting only the distinct ones).

The product of its (nonzero) digits is 2100, while the sum is 26.

The square root of 61705520 is about 7855.2861182773. The cubic root of 61705520 is about 395.1615426417.

The spelling of 61705520 in words is "sixty-one million, seven hundred five thousand, five hundred twenty".