66964998 has 16 divisors (see below), whose sum is σ = 134222400. Its totient is φ = 22272936.

The previous prime is 66964993. The next prime is 66965011. The reversal of 66964998 is 89946966.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66964993) 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, 9148 + ... + 14751.

It is an arithmetic number, because the mean of its divisors is an integer number (8388900).

Almost surely, 2^66964998 is an apocalyptic number.

66964998 is an abundant number, since it is smaller than the sum of its proper divisors (67257402).

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

66964998 is a wasteful number, since it uses less digits than its factorization.

66964998 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24371.

The product of its digits is 5038848, while the sum is 57.

The square root of 66964998 is about 8183.2144051100. The cubic root of 66964998 is about 406.0840702088.

The spelling of 66964998 in words is "sixty-six million, nine hundred sixty-four thousand, nine hundred ninety-eight".