66240770 has 8 divisors (see below), whose sum is σ = 119233404. Its totient is φ = 26496304.

The previous prime is 66240761. The next prime is 66240791. The reversal of 66240770 is 7704266.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 57138481 + 9102289 = 7559^2 + 3017^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×66240770² = 8775679220385800, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3312029 + ... + 3312048.

Almost surely, 2^66240770 is an apocalyptic number.

66240770 is a deficient number, since it is larger than the sum of its proper divisors (52992634).

66240770 is a wasteful number, since it uses less digits than its factorization.

66240770 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6624084.

The product of its (nonzero) digits is 14112, while the sum is 32.

The square root of 66240770 is about 8138.8432839071. The cubic root of 66240770 is about 404.6148245686.

The spelling of 66240770 in words is "sixty-six million, two hundred forty thousand, seven hundred seventy".