66820898 has 8 divisors (see below), whose sum is σ = 102676140. Its totient is φ = 32595520.

The previous prime is 66820889. The next prime is 66820961. The reversal of 66820898 is 89802866.

It can be written as a sum of positive squares in 2 ways, for example, as 51509329 + 15311569 = 7177^2 + 3913^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 407363 + ... + 407526.

Almost surely, 2^66820898 is an apocalyptic number.

66820898 is a deficient number, since it is larger than the sum of its proper divisors (35855242).

66820898 is a wasteful number, since it uses less digits than its factorization.

66820898 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 814932.

The product of its (nonzero) digits is 331776, while the sum is 47.

The square root of 66820898 is about 8174.4050548037. The cubic root of 66820898 is about 405.7925809235.

The spelling of 66820898 in words is "sixty-six million, eight hundred twenty thousand, eight hundred ninety-eight".