64786728 has 32 divisors (see below), whose sum is σ = 171495360. Its totient is φ = 20325120.

The previous prime is 64786721. The next prime is 64786739. The reversal of 64786728 is 82768746.

It is a Smith number, since the sum of its digits (48) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (64786721) 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, 78988 + ... + 79803.

It is an arithmetic number, because the mean of its divisors is an integer number (5359230).

Almost surely, 2^64786728 is an apocalyptic number.

64786728 is a gapful number since it is divisible by the number (68) formed by its first and last digit.

It is an amenable number.

64786728 is an abundant number, since it is smaller than the sum of its proper divisors (106708632).

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

64786728 is a wasteful number, since it uses less digits than its factorization.

64786728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 158817 (or 158813 counting only the distinct ones).

The product of its digits is 903168, while the sum is 48.

The square root of 64786728 is about 8049.0203130567. The cubic root of 64786728 is about 401.6323462198.

The spelling of 64786728 in words is "sixty-four million, seven hundred eighty-six thousand, seven hundred twenty-eight".