66890426 has 8 divisors (see below), whose sum is σ = 100373364. Its totient is φ = 33432640.

The previous prime is 66890423. The next prime is 66890429. The reversal of 66890426 is 62409866.

It is an interprime number because it is at equal distance from previous prime (66890423) and next prime (66890429).

It can be written as a sum of positive squares in 2 ways, for example, as 54745201 + 12145225 = 7399^2 + 3485^2 .

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

It is a super-2 number, since 2×66890426² = 8948658180922952, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (66890423) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3266 + ... + 12018.

Almost surely, 2^66890426 is an apocalyptic number.

66890426 is a deficient number, since it is larger than the sum of its proper divisors (33482938).

66890426 is a wasteful number, since it uses less digits than its factorization.

66890426 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12576.

The product of its (nonzero) digits is 124416, while the sum is 41.

The square root of 66890426 is about 8178.6567356749. The cubic root of 66890426 is about 405.9332762618.

The spelling of 66890426 in words is "sixty-six million, eight hundred ninety thousand, four hundred twenty-six".