104615721 has 24 divisors (see below), whose sum is σ = 172972800. Its totient is φ = 59685696.

The previous prime is 104615717. The next prime is 104615737. The reversal of 104615721 is 127516401.

It is a happy number.

It is not a de Polignac number, because 104615721 - 2² = 104615717 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (104615711) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 65296 + ... + 66878.

It is an arithmetic number, because the mean of its divisors is an integer number (7207200).

Almost surely, 2^104615721 is an apocalyptic number.

It is an amenable number.

104615721 is a deficient number, since it is larger than the sum of its proper divisors (68357079).

104615721 is a wasteful number, since it uses less digits than its factorization.

104615721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2645 (or 2642 counting only the distinct ones).

The product of its (nonzero) digits is 1680, while the sum is 27.

The square root of 104615721 is about 10228.1826831554. The cubic root of 104615721 is about 471.1931672815.

The spelling of 104615721 in words is "one hundred four million, six hundred fifteen thousand, seven hundred twenty-one".