64680786 has 12 divisors (see below), whose sum is σ = 140141742. Its totient is φ = 21560256.

The previous prime is 64680779. The next prime is 64680793. The reversal of 64680786 is 68708646.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (64680779) and next prime (64680793).

It can be written as a sum of positive squares in only one way, i.e., 57471561 + 7209225 = 7581^2 + 2685^2 .

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1796671 + ... + 1796706.

Almost surely, 2^64680786 is an apocalyptic number.

64680786 is an abundant number, since it is smaller than the sum of its proper divisors (75460956).

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

64680786 is a wasteful number, since it uses less digits than its factorization.

64680786 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3593385 (or 3593382 counting only the distinct ones).

The product of its (nonzero) digits is 387072, while the sum is 45.

The square root of 64680786 is about 8042.4365710896. The cubic root of 64680786 is about 401.4133047100.

The spelling of 64680786 in words is "sixty-four million, six hundred eighty thousand, seven hundred eighty-six".