61640706 has 8 divisors (see below), whose sum is σ = 123281424. Its totient is φ = 20546900.

The previous prime is 61640681. The next prime is 61640707. The reversal of 61640706 is 60704616.

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

61640706 is an admirable number.

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 3 ways as a sum of consecutive naturals, for example, 5136720 + ... + 5136731.

It is an arithmetic number, because the mean of its divisors is an integer number (15410178).

Almost surely, 2^61640706 is an apocalyptic number.

61640706 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

61640706 is a wasteful number, since it uses less digits than its factorization.

61640706 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10273456.

The product of its (nonzero) digits is 6048, while the sum is 30.

The square root of 61640706 is about 7851.1595321965. The cubic root of 61640706 is about 395.0231380987.

The spelling of 61640706 in words is "sixty-one million, six hundred forty thousand, seven hundred six".