66770740 has 12 divisors (see below), whose sum is σ = 140218596. Its totient is φ = 26708288.

The previous prime is 66770723. The next prime is 66770777. The reversal of 66770740 is 4707766.

It can be written as a sum of positive squares in 2 ways, for example, as 28281124 + 38489616 = 5318^2 + 6204^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 66770740.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1669249 + ... + 1669288.

It is an arithmetic number, because the mean of its divisors is an integer number (11684883).

Almost surely, 2^66770740 is an apocalyptic number.

It is an amenable number.

66770740 is an abundant number, since it is smaller than the sum of its proper divisors (73447856).

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

66770740 is a wasteful number, since it uses less digits than its factorization.

66770740 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3338546 (or 3338544 counting only the distinct ones).

The product of its (nonzero) digits is 49392, while the sum is 37.

The square root of 66770740 is about 8171.3364879926. The cubic root of 66770740 is about 405.6910216821.

The spelling of 66770740 in words is "sixty-six million, seven hundred seventy thousand, seven hundred forty".