64640401 has 8 divisors (see below), whose sum is σ = 73924160. Its totient is φ = 55369008.

The previous prime is 64640399. The next prime is 64640437. The reversal of 64640401 is 10404646.

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 64640401 - 2¹ = 64640399 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (64640501) 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, 15955 + ... + 19591.

It is an arithmetic number, because the mean of its divisors is an integer number (9240520).

Almost surely, 2^64640401 is an apocalyptic number.

It is an amenable number.

64640401 is a deficient number, since it is larger than the sum of its proper divisors (9283759).

64640401 is a wasteful number, since it uses less digits than its factorization.

64640401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6183.

The product of its (nonzero) digits is 2304, while the sum is 25.

The square root of 64640401 is about 8039.9254349776. The cubic root of 64640401 is about 401.3297433083.

The spelling of 64640401 in words is "sixty-four million, six hundred forty thousand, four hundred one".