66791370 has 32 divisors (see below), whose sum is σ = 160745472. Its totient is φ = 17761472.

The previous prime is 66791357. The next prime is 66791381. The reversal of 66791370 is 7319766.

It is a super-2 number, since 2×66791370² = 8922174212953800, which contains 22 as substring.

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 15 ways as a sum of consecutive naturals, for example, 8584 + ... + 14396.

It is an arithmetic number, because the mean of its divisors is an integer number (5023296).

Almost surely, 2^66791370 is an apocalyptic number.

66791370 is an abundant number, since it is smaller than the sum of its proper divisors (93954102).

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

66791370 is a wasteful number, since it uses less digits than its factorization.

66791370 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6206.

The product of its (nonzero) digits is 47628, while the sum is 39.

The square root of 66791370 is about 8172.5987299023. The cubic root of 66791370 is about 405.7327991831.

It can be divided in two parts, 66791 and 370, that added together give a triangular number (67161 = T₃₆₆).

The spelling of 66791370 in words is "sixty-six million, seven hundred ninety-one thousand, three hundred seventy".