66398814 has 24 divisors (see below), whose sum is σ = 145292472. Its totient is φ = 21913200.

The previous prime is 66398747. The next prime is 66398819. The reversal of 66398814 is 41889366.

66398814 is a `hidden beast` number, since 6 + 639 + 8 + 8 + 1 + 4 = 666.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 66398814.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66398819) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 16444 + ... + 20079.

It is an arithmetic number, because the mean of its divisors is an integer number (6053853).

Almost surely, 2^66398814 is an apocalyptic number.

66398814 is an abundant number, since it is smaller than the sum of its proper divisors (78893658).

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

66398814 is a wasteful number, since it uses less digits than its factorization.

66398814 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36632 (or 36629 counting only the distinct ones).

The product of its digits is 248832, while the sum is 45.

The square root of 66398814 is about 8148.5467415975. The cubic root of 66398814 is about 404.9363594561.

The spelling of 66398814 in words is "sixty-six million, three hundred ninety-eight thousand, eight hundred fourteen".