66457730 has 16 divisors (see below), whose sum is σ = 119929464. Its totient is φ = 26515200.

The previous prime is 66457693. The next prime is 66457751. The reversal of 66457730 is 3775466.

It can be written as a sum of positive squares in 4 ways, for example, as 66406201 + 51529 = 8149^2 + 227^2 .

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 7 ways as a sum of consecutive naturals, for example, 4277 + ... + 12296.

Almost surely, 2^66457730 is an apocalyptic number.

66457730 is a deficient number, since it is larger than the sum of its proper divisors (53471734).

66457730 is a wasteful number, since it uses less digits than its factorization.

66457730 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16981.

The product of its (nonzero) digits is 105840, while the sum is 38.

The square root of 66457730 is about 8152.1610631783. The cubic root of 66457730 is about 405.0560914030.

The spelling of 66457730 in words is "sixty-six million, four hundred fifty-seven thousand, seven hundred thirty".