66319290 has 32 divisors (see below), whose sum is σ = 176852160. Its totient is φ = 17685072.

The previous prime is 66319289. The next prime is 66319307. The reversal of 66319290 is 9291366.

It is a super-2 number, since 2×66319290² = 8796496452208200, which contains 22 as substring.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 122544 + ... + 123083.

It is an arithmetic number, because the mean of its divisors is an integer number (5526630).

Almost surely, 2^66319290 is an apocalyptic number.

66319290 is an abundant number, since it is smaller than the sum of its proper divisors (110532870).

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

66319290 is a wasteful number, since it uses less digits than its factorization.

66319290 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 245643 (or 245637 counting only the distinct ones).

The product of its (nonzero) digits is 17496, while the sum is 36.

The square root of 66319290 is about 8143.6656365546. The cubic root of 66319290 is about 404.7746345620.

The spelling of 66319290 in words is "sixty-six million, three hundred nineteen thousand, two hundred ninety".