61720368 has 20 divisors (see below), whose sum is σ = 159444408. Its totient is φ = 20573440.

The previous prime is 61720363. The next prime is 61720369. The reversal of 61720368 is 86302716.

It is not an unprimeable number, because it can be changed into a prime (61720363) 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, 642873 + ... + 642968.

Almost surely, 2^61720368 is an apocalyptic number.

It is an amenable number.

61720368 is an abundant number, since it is smaller than the sum of its proper divisors (97724040).

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

61720368 is a wasteful number, since it uses less digits than its factorization.

61720368 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1285852 (or 1285846 counting only the distinct ones).

The product of its (nonzero) digits is 12096, while the sum is 33.

The square root of 61720368 is about 7856.2311574953. The cubic root of 61720368 is about 395.1932355817.

The spelling of 61720368 in words is "sixty-one million, seven hundred twenty thousand, three hundred sixty-eight".