64667740 has 12 divisors (see below), whose sum is σ = 135802296. Its totient is φ = 25867088.

The previous prime is 64667731. The next prime is 64667777. The reversal of 64667740 is 4776646.

64667740 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a junction number, because it is equal to n+sod(n) for n = 64667693 and 64667702.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1616674 + ... + 1616713.

It is an arithmetic number, because the mean of its divisors is an integer number (11316858).

Almost surely, 2^64667740 is an apocalyptic number.

It is an amenable number.

64667740 is an abundant number, since it is smaller than the sum of its proper divisors (71134556).

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

64667740 is a wasteful number, since it uses less digits than its factorization.

64667740 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3233396 (or 3233394 counting only the distinct ones).

The product of its (nonzero) digits is 169344, while the sum is 40.

The square root of 64667740 is about 8041.6254575801. The cubic root of 64667740 is about 401.3863147777.

It can be divided in two parts, 646 and 67740, that added together give a palindrome (68386).

The spelling of 64667740 in words is "sixty-four million, six hundred sixty-seven thousand, seven hundred forty".