61660730 has 16 divisors (see below), whose sum is σ = 113084424. Its totient is φ = 24198720.

The previous prime is 61660657. The next prime is 61660777. The reversal of 61660730 is 3706616.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 58629649 + 3031081 = 7657^2 + 1741^2 .

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 61660693 and 61660702.

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, 57641 + ... + 58700.

Almost surely, 2^61660730 is an apocalyptic number.

61660730 is a deficient number, since it is larger than the sum of its proper divisors (51423694).

61660730 is a wasteful number, since it uses less digits than its factorization.

61660730 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 116401.

The product of its (nonzero) digits is 4536, while the sum is 29.

The square root of 61660730 is about 7852.4346542967. The cubic root of 61660730 is about 395.0659079255.

The spelling of 61660730 in words is "sixty-one million, six hundred sixty thousand, seven hundred thirty".