61665730 has 16 divisors (see below), whose sum is σ = 126855360. Its totient is φ = 21142512.

The previous prime is 61665719. The next prime is 61665733. The reversal of 61665730 is 3756616.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (61665733) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 440400 + ... + 440539.

It is an arithmetic number, because the mean of its divisors is an integer number (7928460).

Almost surely, 2^61665730 is an apocalyptic number.

61665730 is an abundant number, since it is smaller than the sum of its proper divisors (65189630).

61665730 is a wasteful number, since it uses less digits than its factorization.

61665730 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 880953.

The product of its (nonzero) digits is 22680, while the sum is 34.

The square root of 61665730 is about 7852.7530204381. The cubic root of 61665730 is about 395.0765861219.

The spelling of 61665730 in words is "sixty-one million, six hundred sixty-five thousand, seven hundred thirty".