64098721 has 8 divisors (see below), whose sum is σ = 69020640. Its totient is φ = 59304768.

The previous prime is 64098719. The next prime is 64098733. The reversal of 64098721 is 12789046.

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 64098721 - 2¹ = 64098719 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (64098781) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 30951 + ... + 32956.

It is an arithmetic number, because the mean of its divisors is an integer number (8627580).

Almost surely, 2^64098721 is an apocalyptic number.

It is an amenable number.

64098721 is a deficient number, since it is larger than the sum of its proper divisors (4921919).

64098721 is a wasteful number, since it uses less digits than its factorization.

64098721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63983.

The product of its (nonzero) digits is 24192, while the sum is 37.

The square root of 64098721 is about 8006.1676849789. The cubic root of 64098721 is about 400.2055630914.

The spelling of 64098721 in words is "sixty-four million, ninety-eight thousand, seven hundred twenty-one".