64037721 has 8 divisors (see below), whose sum is σ = 93145824. Its totient is φ = 38810720.

The previous prime is 64037711. The next prime is 64037731. The reversal of 64037721 is 12773046.

64037721 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (64037711) and next prime (64037731).

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

It is a cyclic number.

It is not a de Polignac number, because 64037721 - 2¹⁷ = 63906649 is a prime.

It is not an unprimeable number, because it can be changed into a prime (64037711) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 970236 + ... + 970301.

It is an arithmetic number, because the mean of its divisors is an integer number (11643228).

Almost surely, 2^64037721 is an apocalyptic number.

It is an amenable number.

64037721 is a deficient number, since it is larger than the sum of its proper divisors (29108103).

64037721 is a wasteful number, since it uses less digits than its factorization.

64037721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1940551.

The product of its (nonzero) digits is 7056, while the sum is 30.

The square root of 64037721 is about 8002.3572152210. The cubic root of 64037721 is about 400.0785699826.

The spelling of 64037721 in words is "sixty-four million, thirty-seven thousand, seven hundred twenty-one".