61721662 has 8 divisors (see below), whose sum is σ = 98028576. Its totient is φ = 29045472.

The previous prime is 61721659. The next prime is 61721677. The reversal of 61721662 is 26612716.

It is a happy number.

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

It is a congruent number.

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, 907638 + ... + 907705.

It is an arithmetic number, because the mean of its divisors is an integer number (12253572).

Almost surely, 2^61721662 is an apocalyptic number.

61721662 is a deficient number, since it is larger than the sum of its proper divisors (36306914).

61721662 is a wasteful number, since it uses less digits than its factorization.

61721662 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1815362.

The product of its digits is 6048, while the sum is 31.

The square root of 61721662 is about 7856.3135120742. The cubic root of 61721662 is about 395.1959973738.

The spelling of 61721662 in words is "sixty-one million, seven hundred twenty-one thousand, six hundred sixty-two".