66614820 has 24 divisors (see below), whose sum is σ = 186521664. Its totient is φ = 17763936.

The previous prime is 66614819. The next prime is 66614833. The reversal of 66614820 is 2841666.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 555064 + ... + 555183.

It is an arithmetic number, because the mean of its divisors is an integer number (7771736).

Almost surely, 2^66614820 is an apocalyptic number.

66614820 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

66614820 is an abundant number, since it is smaller than the sum of its proper divisors (119906844).

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

66614820 is a wasteful number, since it uses less digits than its factorization.

66614820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1110259 (or 1110257 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 33.

The square root of 66614820 is about 8161.7902447931. The cubic root of 66614820 is about 405.3749918109.

The spelling of 66614820 in words is "sixty-six million, six hundred fourteen thousand, eight hundred twenty".