64720401 has 8 divisors (see below), whose sum is σ = 86332224. Its totient is φ = 43127760.

The previous prime is 64720393. The next prime is 64720417. The reversal of 64720401 is 10402746.

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

It is not a de Polignac number, because 64720401 - 2³ = 64720393 is a prime.

It is not an unprimeable number, because it can be changed into a prime (64720421) 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, 7831 + ... + 13811.

It is an arithmetic number, because the mean of its divisors is an integer number (10791528).

Almost surely, 2^64720401 is an apocalyptic number.

It is an amenable number.

64720401 is a deficient number, since it is larger than the sum of its proper divisors (21611823).

64720401 is a wasteful number, since it uses less digits than its factorization.

64720401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9591.

The product of its (nonzero) digits is 1344, while the sum is 24.

The square root of 64720401 is about 8044.8990671108. The cubic root of 64720401 is about 401.4952391022.

The spelling of 64720401 in words is "sixty-four million, seven hundred twenty thousand, four hundred one".