61304721 has 8 divisors (see below), whose sum is σ = 81776160. Its totient is φ = 40851552.

The previous prime is 61304657. The next prime is 61304741. The reversal of 61304721 is 12740316.

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

It is not a de Polignac number, because 61304721 - 2⁶ = 61304657 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 61304691 and 61304700.

It is not an unprimeable number, because it can be changed into a prime (61304741) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9165 + ... + 14373.

It is an arithmetic number, because the mean of its divisors is an integer number (10222020).

Almost surely, 2^61304721 is an apocalyptic number.

It is an amenable number.

61304721 is a deficient number, since it is larger than the sum of its proper divisors (20471439).

61304721 is a wasteful number, since it uses less digits than its factorization.

61304721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9135.

The product of its (nonzero) digits is 1008, while the sum is 24.

The square root of 61304721 is about 7829.7331372148. The cubic root of 61304721 is about 394.3041125668.

The spelling of 61304721 in words is "sixty-one million, three hundred four thousand, seven hundred twenty-one".