61720393 has 8 divisors (see below), whose sum is σ = 71236800. Its totient is φ = 52378800.

The previous prime is 61720369. The next prime is 61720397. The reversal of 61720393 is 39302716.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-61720393 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61720397) 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, 42943 + ... + 44356.

It is an arithmetic number, because the mean of its divisors is an integer number (8904600).

Almost surely, 2^61720393 is an apocalyptic number.

It is an amenable number.

61720393 is a deficient number, since it is larger than the sum of its proper divisors (9516407).

61720393 is a wasteful number, since it uses less digits than its factorization.

61720393 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 87407.

The product of its (nonzero) digits is 6804, while the sum is 31.

The square root of 61720393 is about 7856.2327485889. The cubic root of 61720393 is about 395.1932889397.

The spelling of 61720393 in words is "sixty-one million, seven hundred twenty thousand, three hundred ninety-three".