64728140 has 12 divisors (see below), whose sum is σ = 135929136. Its totient is φ = 25891248.

The previous prime is 64728107. The next prime is 64728143. The reversal of 64728140 is 4182746.

It is a hoax number, since the sum of its digits (32) coincides with the sum of the digits of its distinct prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 64728097 and 64728106.

It is not an unprimeable number, because it can be changed into a prime (64728143) 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, 1618184 + ... + 1618223.

It is an arithmetic number, because the mean of its divisors is an integer number (11327428).

Almost surely, 2^64728140 is an apocalyptic number.

It is an amenable number.

64728140 is an abundant number, since it is smaller than the sum of its proper divisors (71200996).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

64728140 is a wasteful number, since it uses less digits than its factorization.

64728140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3236416 (or 3236414 counting only the distinct ones).

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

The square root of 64728140 is about 8045.3800407439. The cubic root of 64728140 is about 401.5112415155.

The spelling of 64728140 in words is "sixty-four million, seven hundred twenty-eight thousand, one hundred forty".