73821668 has 6 divisors (see below), whose sum is σ = 129187926. Its totient is φ = 36910832.

The previous prime is 73821659. The next prime is 73821679. The reversal of 73821668 is 86612837.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 59320804 + 14500864 = 7702^2 + 3808^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9227705 + ... + 9227712.

It is an arithmetic number, because the mean of its divisors is an integer number (21531321).

Almost surely, 2^73821668 is an apocalyptic number.

It is an amenable number.

73821668 is a deficient number, since it is larger than the sum of its proper divisors (55366258).

73821668 is a wasteful number, since it uses less digits than its factorization.

73821668 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18455421 (or 18455419 counting only the distinct ones).

The product of its digits is 96768, while the sum is 41.

The square root of 73821668 is about 8591.9536777150. The cubic root of 73821668 is about 419.4961228719.

The spelling of 73821668 in words is "seventy-three million, eight hundred twenty-one thousand, six hundred sixty-eight".