66740070 has 16 divisors (see below), whose sum is σ = 160176240. Its totient is φ = 17797344.

The previous prime is 66740059. The next prime is 66740077. The reversal of 66740070 is 7004766.

It is a Harshad number since it is a multiple of its sum of digits (30), and also a Moran number because the ratio is a prime number: 2224669 = 66740070 / (6 + 6 + 7 + 4 + 0 + 0 + 7 + 0).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66740077) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1112305 + ... + 1112364.

It is an arithmetic number, because the mean of its divisors is an integer number (10011015).

Almost surely, 2^66740070 is an apocalyptic number.

66740070 is an abundant number, since it is smaller than the sum of its proper divisors (93436170).

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

66740070 is a wasteful number, since it uses less digits than its factorization.

66740070 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2224679.

The product of its (nonzero) digits is 7056, while the sum is 30.

The square root of 66740070 is about 8169.4595904503. The cubic root of 66740070 is about 405.6288964198.

The spelling of 66740070 in words is "sixty-six million, seven hundred forty thousand, seventy".