64084721 has 4 divisors (see below), whose sum is σ = 64896000. Its totient is φ = 63273444.

The previous prime is 64084711. The next prime is 64084723. The reversal of 64084721 is 12748046.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-64084721 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (64084723) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 405521 + ... + 405678.

It is an arithmetic number, because the mean of its divisors is an integer number (16224000).

Almost surely, 2^64084721 is an apocalyptic number.

It is an amenable number.

64084721 is a deficient number, since it is larger than the sum of its proper divisors (811279).

64084721 is an equidigital number, since it uses as much as digits as its factorization.

64084721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 811278.

The product of its (nonzero) digits is 10752, while the sum is 32.

The square root of 64084721 is about 8005.2933113035. The cubic root of 64084721 is about 400.1764242581.

The spelling of 64084721 in words is "sixty-four million, eighty-four thousand, seven hundred twenty-one".