61720394 has 8 divisors (see below), whose sum is σ = 94733760. Its totient is φ = 30142476.

The previous prime is 61720369. The next prime is 61720397. The reversal of 61720394 is 49302716.

61720394 = 1177² + 1178² + ... + 1219².

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

It is a self number, because there is not a number n which added to its sum of digits gives 61720394.

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 3 ways as a sum of consecutive naturals, for example, 358754 + ... + 358925.

It is an arithmetic number, because the mean of its divisors is an integer number (11841720).

Almost surely, 2^61720394 is an apocalyptic number.

61720394 is a deficient number, since it is larger than the sum of its proper divisors (33013366).

61720394 is a wasteful number, since it uses less digits than its factorization.

61720394 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 717724.

The product of its (nonzero) digits is 9072, while the sum is 32.

The square root of 61720394 is about 7856.2328122326. The cubic root of 61720394 is about 395.1932910740.

The spelling of 61720394 in words is "sixty-one million, seven hundred twenty thousand, three hundred ninety-four".