66764370 has 32 divisors (see below), whose sum is σ = 162171072. Its totient is φ = 17588672.

The previous prime is 66764339. The next prime is 66764371. The reversal of 66764370 is 7346766.

It is a super-2 number, since 2×66764370² = 8914962202993800, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (66764371) by changing a digit.

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, 10917 + ... + 15896.

It is an arithmetic number, because the mean of its divisors is an integer number (5067846).

Almost surely, 2^66764370 is an apocalyptic number.

66764370 is an abundant number, since it is smaller than the sum of its proper divisors (95406702).

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

66764370 is a wasteful number, since it uses less digits than its factorization.

66764370 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26906.

The product of its (nonzero) digits is 127008, while the sum is 39.

The square root of 66764370 is about 8170.9467015763. The cubic root of 66764370 is about 405.6781201527.

The spelling of 66764370 in words is "sixty-six million, seven hundred sixty-four thousand, three hundred seventy".