64680785 has 16 divisors (see below), whose sum is σ = 83954640. Its totient is φ = 47554560.

The previous prime is 64680779. The next prime is 64680793. The reversal of 64680785 is 58708646.

It can be written as a sum of positive squares in 8 ways, for example, as 744769 + 63936016 = 863^2 + 7996^2 .

It is not a de Polignac number, because 64680785 - 2¹⁴ = 64664401 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13601 + ... + 17729.

It is an arithmetic number, because the mean of its divisors is an integer number (5247165).

Almost surely, 2^64680785 is an apocalyptic number.

64680785 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

It is an amenable number.

64680785 is a deficient number, since it is larger than the sum of its proper divisors (19273855).

64680785 is a wasteful number, since it uses less digits than its factorization.

64680785 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4388.

The product of its (nonzero) digits is 322560, while the sum is 44.

The square root of 64680785 is about 8042.4365089194. The cubic root of 64680785 is about 401.4133026413.

The spelling of 64680785 in words is "sixty-four million, six hundred eighty thousand, seven hundred eighty-five".