61720712 has 16 divisors (see below), whose sum is σ = 116920860. Its totient is φ = 30541824.

The previous prime is 61720679. The next prime is 61720723. The reversal of 61720712 is 21702716.

It can be written as a sum of positive squares in 2 ways, for example, as 56942116 + 4778596 = 7546^2 + 2186^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 38993 + ... + 40544.

Almost surely, 2^61720712 is an apocalyptic number.

It is an amenable number.

61720712 is a deficient number, since it is larger than the sum of its proper divisors (55200148).

61720712 is a wasteful number, since it uses less digits than its factorization.

61720712 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 79640 (or 79636 counting only the distinct ones).

The product of its (nonzero) digits is 1176, while the sum is 26.

The square root of 61720712 is about 7856.2530509143. The cubic root of 61720712 is about 395.1939697867.

The spelling of 61720712 in words is "sixty-one million, seven hundred twenty thousand, seven hundred twelve".