66467820 has 24 divisors (see below), whose sum is σ = 186110064. Its totient is φ = 17724736.

The previous prime is 66467803. The next prime is 66467827. The reversal of 66467820 is 2876466.

It is not an unprimeable number, because it can be changed into a prime (66467827) 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, 553839 + ... + 553958.

It is an arithmetic number, because the mean of its divisors is an integer number (7754586).

Almost surely, 2^66467820 is an apocalyptic number.

66467820 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

66467820 is an abundant number, since it is smaller than the sum of its proper divisors (119642244).

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

66467820 is a wasteful number, since it uses less digits than its factorization.

66467820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1107809 (or 1107807 counting only the distinct ones).

The product of its (nonzero) digits is 96768, while the sum is 39.

The square root of 66467820 is about 8152.7798939993. The cubic root of 66467820 is about 405.0765896914.

The spelling of 66467820 in words is "sixty-six million, four hundred sixty-seven thousand, eight hundred twenty".