61640705 has 16 divisors (see below), whose sum is σ = 86822400. Its totient is φ = 41124672.

The previous prime is 61640681. The next prime is 61640707. The reversal of 61640705 is 50704616.

It is a cyclic number.

It is not a de Polignac number, because 61640705 - 2¹² = 61636609 is a prime.

It is not an unprimeable number, because it can be changed into a prime (61640707) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 22505 + ... + 25094.

It is an arithmetic number, because the mean of its divisors is an integer number (5426400).

Almost surely, 2^61640705 is an apocalyptic number.

It is an amenable number.

61640705 is a deficient number, since it is larger than the sum of its proper divisors (25181695).

61640705 is a wasteful number, since it uses less digits than its factorization.

61640705 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47648.

The product of its (nonzero) digits is 5040, while the sum is 29.

The square root of 61640705 is about 7851.1594685116. The cubic root of 61640705 is about 395.0231359626.

The spelling of 61640705 in words is "sixty-one million, six hundred forty thousand, seven hundred five".