66620590 has 8 divisors (see below), whose sum is σ = 119917080. Its totient is φ = 26648232.

The previous prime is 66620563. The next prime is 66620597. The reversal of 66620590 is 9502666.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66620597) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3331020 + ... + 3331039.

It is an arithmetic number, because the mean of its divisors is an integer number (14989635).

Almost surely, 2^66620590 is an apocalyptic number.

66620590 is a deficient number, since it is larger than the sum of its proper divisors (53296490).

66620590 is a wasteful number, since it uses less digits than its factorization.

66620590 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6662066.

The product of its (nonzero) digits is 19440, while the sum is 34.

The square root of 66620590 is about 8162.1437135106. The cubic root of 66620590 is about 405.3866956439.

The spelling of 66620590 in words is "sixty-six million, six hundred twenty thousand, five hundred ninety".