61705765 has 24 divisors (see below), whose sum is σ = 84220920. Its totient is φ = 43317120.

The previous prime is 61705753. The next prime is 61705771. The reversal of 61705765 is 56750716.

It can be written as a sum of positive squares in 4 ways, for example, as 21141604 + 40564161 = 4598^2 + 6369^2 .

It is not a de Polignac number, because 61705765 - 2¹⁵ = 61672997 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 15787 + ... + 19303.

It is an arithmetic number, because the mean of its divisors is an integer number (3509205).

Almost surely, 2^61705765 is an apocalyptic number.

It is an amenable number.

61705765 is a deficient number, since it is larger than the sum of its proper divisors (22515155).

61705765 is a wasteful number, since it uses less digits than its factorization.

61705765 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3573 (or 3562 counting only the distinct ones).

The product of its (nonzero) digits is 44100, while the sum is 37.

The square root of 61705765 is about 7855.3017128561. The cubic root of 61705765 is about 395.1620656335.

It can be divided in two parts, 6170 and 5765, that added together give a triangular number (11935 = T₁₅₄).

The spelling of 61705765 in words is "sixty-one million, seven hundred five thousand, seven hundred sixty-five".