66802920 has 32 divisors (see below), whose sum is σ = 200409120. Its totient is φ = 17814080.

The previous prime is 66802909. The next prime is 66802943. The reversal of 66802920 is 2920866.

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, 278226 + ... + 278465.

It is an arithmetic number, because the mean of its divisors is an integer number (6262785).

Almost surely, 2^66802920 is an apocalyptic number.

66802920 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

66802920 is an abundant number, since it is smaller than the sum of its proper divisors (133606200).

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

66802920 is a wasteful number, since it uses less digits than its factorization.

66802920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 556705 (or 556701 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 33.

The square root of 66802920 is about 8173.3053289352. The cubic root of 66802920 is about 405.7561851571.

The spelling of 66802920 in words is "sixty-six million, eight hundred two thousand, nine hundred twenty".