65721692 has 12 divisors (see below), whose sum is σ = 115070760. Its totient is φ = 32844336.

The previous prime is 65721683. The next prime is 65721709. The reversal of 65721692 is 29612756.

It is a happy number.

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, 10934 + ... + 15842.

It is an arithmetic number, because the mean of its divisors is an integer number (9589230).

Almost surely, 2^65721692 is an apocalyptic number.

It is an amenable number.

65721692 is a deficient number, since it is larger than the sum of its proper divisors (49349068).

65721692 is a wasteful number, since it uses less digits than its factorization.

65721692 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8260 (or 8258 counting only the distinct ones).

The product of its digits is 45360, while the sum is 38.

The square root of 65721692 is about 8106.8916361328. The cubic root of 65721692 is about 403.5551666942. Note that the first 3 decimals are identical.

The spelling of 65721692 in words is "sixty-five million, seven hundred twenty-one thousand, six hundred ninety-two".