61645765 has 8 divisors (see below), whose sum is σ = 74170368. Its totient is φ = 49186320.

The previous prime is 61645751. The next prime is 61645781. The reversal of 61645765 is 56754616.

61645765 is nontrivially palindromic in base 13.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 61645765 - 2¹⁵ = 61612997 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14181 + ... + 18010.

It is an arithmetic number, because the mean of its divisors is an integer number (9271296).

Almost surely, 2^61645765 is an apocalyptic number.

It is an amenable number.

61645765 is a deficient number, since it is larger than the sum of its proper divisors (12524603).

61645765 is a wasteful number, since it uses less digits than its factorization.

61645765 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32579.

The product of its digits is 151200, while the sum is 40.

The square root of 61645765 is about 7851.4817072958. The cubic root of 61645765 is about 395.0339446340.

The spelling of 61645765 in words is "sixty-one million, six hundred forty-five thousand, seven hundred sixty-five".