64728401 has 4 divisors (see below), whose sum is σ = 68535972. Its totient is φ = 60920832.

The previous prime is 64728379. The next prime is 64728407. The reversal of 64728401 is 10482746.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 18284176 + 46444225 = 4276^2 + 6815^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-64728401 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (64728407) 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, 1903760 + ... + 1903793.

It is an arithmetic number, because the mean of its divisors is an integer number (17133993).

Almost surely, 2^64728401 is an apocalyptic number.

It is an amenable number.

64728401 is a deficient number, since it is larger than the sum of its proper divisors (3807571).

64728401 is a wasteful number, since it uses less digits than its factorization.

64728401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3807570.

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

The square root of 64728401 is about 8045.3962612167. The cubic root of 64728401 is about 401.5117811793.

The spelling of 64728401 in words is "sixty-four million, seven hundred twenty-eight thousand, four hundred one".