66898320 has 40 divisors (see below), whose sum is σ = 207385536. Its totient is φ = 17839488.

The previous prime is 66898319. The next prime is 66898327. The reversal of 66898320 is 2389866.

It is a tau number, because it is divible by the number of its divisors (40).

It is not an unprimeable number, because it can be changed into a prime (66898327) 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, 139132 + ... + 139611.

Almost surely, 2^66898320 is an apocalyptic number.

66898320 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

66898320 is an abundant number, since it is smaller than the sum of its proper divisors (140487216).

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

66898320 is a wasteful number, since it uses less digits than its factorization.

66898320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 278759 (or 278753 counting only the distinct ones).

The product of its (nonzero) digits is 124416, while the sum is 42.

The square root of 66898320 is about 8179.1393190237. The cubic root of 66898320 is about 405.9492442233.

The spelling of 66898320 in words is "sixty-six million, eight hundred ninety-eight thousand, three hundred twenty".